diff --git a/src/Lending/Book/Domain/AvailableBook.php b/src/Lending/Book/Domain/AvailableBook.php
index 613db92..8174a58 100644
--- a/src/Lending/Book/Domain/AvailableBook.php
+++ b/src/Lending/Book/Domain/AvailableBook.php
@@ -12,8 +12,7 @@
 final readonly class AvailableBook implements Book
 {
     public function __construct(
-        public BookId $bookId,
-        public BookType $bookType,
+        public BookInformation $bookInformation,
         public LibraryBranchId $libraryBranch,
         public Version $version)
     {
@@ -21,12 +20,12 @@ public function __construct(
 
     public function bookId(): BookId
     {
-        return $this->bookId;
+        return $this->bookInformation->bookId;
     }
 
     public function bookType(): BookType
     {
-        return $this->bookType;
+        return $this->bookInformation->bookType;
     }
 
     public function version(): Version
@@ -36,6 +35,6 @@ public function version(): Version
 
     public function isRestricted(): bool
     {
-        return $this->bookType === BookType::RESTRICTED;
+        return $this->bookInformation->bookType === BookType::RESTRICTED;
     }
 }
diff --git a/src/Lending/Book/Domain/BookInformation.php b/src/Lending/Book/Domain/BookInformation.php
new file mode 100644
index 0000000..fb1991d
--- /dev/null
+++ b/src/Lending/Book/Domain/BookInformation.php
@@ -0,0 +1,15 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Akondas\Library\Lending\Book\Domain;
+
+use Akondas\Library\Catalogue\BookId;
+use Akondas\Library\Catalogue\BookType;
+
+final readonly class BookInformation
+{
+    public function __construct(public BookId $bookId, public BookType $bookType)
+    {
+    }
+}
diff --git a/src/Lending/Book/Domain/BookOnHold.php b/src/Lending/Book/Domain/BookOnHold.php
index 09e8905..cefad1b 100644
--- a/src/Lending/Book/Domain/BookOnHold.php
+++ b/src/Lending/Book/Domain/BookOnHold.php
@@ -13,8 +13,7 @@
 final readonly class BookOnHold implements Book
 {
     public function __construct(
-        public BookId $bookId,
-        public BookType $bookType,
+        public BookInformation $bookInformation,
         public LibraryBranchId $libraryBranch,
         public PatronId $byPatron,
         public \DateTimeImmutable $holdTill,
@@ -29,12 +28,12 @@ public function by(PatronId $patronId): bool
 
     public function bookId(): BookId
     {
-        return $this->bookId;
+        return $this->bookInformation->bookId;
     }
 
     public function bookType(): BookType
     {
-        return $this->bookType;
+        return $this->bookInformation->bookType;
     }
 
     public function version(): Version
diff --git a/src/Lending/Patron/Domain/CheckoutDuration.php b/src/Lending/Patron/Domain/CheckoutDuration.php
new file mode 100644
index 0000000..1561340
--- /dev/null
+++ b/src/Lending/Patron/Domain/CheckoutDuration.php
@@ -0,0 +1,27 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Akondas\Library\Lending\Patron\Domain;
+
+final readonly class CheckoutDuration
+{
+    public const int MAX_CHECKOUT_DURATION = 60;
+
+    public function __construct(public \DateTimeImmutable $from, public NumberOfDays $noOfDays)
+    {
+        if ($this->noOfDays->isGreaterThan(self::MAX_CHECKOUT_DURATION)) {
+            throw new \InvalidArgumentException(sprintf('Cannot checkout for more than %s days!', self::MAX_CHECKOUT_DURATION));
+        }
+    }
+
+    public static function maxDuration(): self
+    {
+        return new self(new \DateTimeImmutable(), NumberOfDays::of(self::MAX_CHECKOUT_DURATION));
+    }
+
+    public function to(): \DateTimeImmutable
+    {
+        return $this->from->modify(sprintf('+%d days', $this->noOfDays->days));
+    }
+}
diff --git a/src/Lending/Patron/Domain/PatronEvent/BookCheckedOut.php b/src/Lending/Patron/Domain/PatronEvent/BookCheckedOut.php
new file mode 100644
index 0000000..4322916
--- /dev/null
+++ b/src/Lending/Patron/Domain/PatronEvent/BookCheckedOut.php
@@ -0,0 +1,60 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Akondas\Library\Lending\Patron\Domain\PatronEvent;
+
+use Akondas\Library\Catalogue\BookId;
+use Akondas\Library\Catalogue\BookType;
+use Akondas\Library\Common\UUID;
+use Akondas\Library\Lending\LibraryBranch\Domain\LibraryBranchId;
+use Akondas\Library\Lending\Patron\Domain\CheckoutDuration;
+use Akondas\Library\Lending\Patron\Domain\PatronEvent;
+use Akondas\Library\Lending\Patron\Domain\PatronId;
+
+final readonly class BookCheckedOut implements PatronEvent
+{
+    private function __construct(
+        public UUID $eventId,
+        public PatronId $patronId,
+        public BookId $bookId,
+        public BookType $bookType,
+        public LibraryBranchId $libraryBranchId,
+        public \DateTimeImmutable $when,
+        public \DateTimeImmutable $till,
+    ) {
+    }
+
+    public static function now(PatronId $patronId, BookId $bookId, BookType $bookType, LibraryBranchId $libraryBranchId, CheckoutDuration $checkoutDuration): self
+    {
+        return new self(
+            UUID::random(),
+            $patronId,
+            $bookId,
+            $bookType,
+            $libraryBranchId,
+            new \DateTimeImmutable(),
+            $checkoutDuration->to()
+        );
+    }
+
+    public function patronId(): PatronId
+    {
+        return $this->patronId;
+    }
+
+    public function eventId(): UUID
+    {
+        return $this->eventId;
+    }
+
+    public function aggregateId(): UUID
+    {
+        return $this->patronId->patronId;
+    }
+
+    public function when(): \DateTimeImmutable
+    {
+        return $this->when;
+    }
+}
diff --git a/src/Lending/Patron/Domain/PatronEvent/BookPlacedOnHold.php b/src/Lending/Patron/Domain/PatronEvent/BookPlacedOnHold.php
index 10500df..e30d003 100644
--- a/src/Lending/Patron/Domain/PatronEvent/BookPlacedOnHold.php
+++ b/src/Lending/Patron/Domain/PatronEvent/BookPlacedOnHold.php
@@ -12,7 +12,7 @@
 use Akondas\Library\Lending\Patron\Domain\PatronEvent;
 use Akondas\Library\Lending\Patron\Domain\PatronId;
 
-final class BookPlacedOnHold implements PatronEvent
+final readonly class BookPlacedOnHold implements PatronEvent
 {
     private function __construct(
         public UUID $eventId,
diff --git a/src/Lending/Patron/Domain/PatronEvent/MaximumNumberOnHoldsReached.php b/src/Lending/Patron/Domain/PatronEvent/MaximumNumberOnHoldsReached.php
new file mode 100644
index 0000000..b309e9b
--- /dev/null
+++ b/src/Lending/Patron/Domain/PatronEvent/MaximumNumberOnHoldsReached.php
@@ -0,0 +1,50 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Akondas\Library\Lending\Patron\Domain\PatronEvent;
+
+use Akondas\Library\Common\UUID;
+use Akondas\Library\Lending\Patron\Domain\PatronEvent;
+use Akondas\Library\Lending\Patron\Domain\PatronId;
+
+final readonly class MaximumNumberOnHoldsReached implements PatronEvent
+{
+    private function __construct(
+        public UUID $eventId,
+        public \DateTimeImmutable $when,
+        public PatronId $patronId,
+        public int $numberOfHolds
+    ) {
+    }
+
+    public static function now(PatronId $patronId, int $numberOfHolds): self
+    {
+        return new self(
+            UUID::random(),
+            new \DateTimeImmutable(),
+            $patronId,
+            $numberOfHolds
+        );
+    }
+
+    public function patronId(): PatronId
+    {
+        return $this->patronId;
+    }
+
+    public function eventId(): UUID
+    {
+        return $this->eventId;
+    }
+
+    public function aggregateId(): UUID
+    {
+        return $this->patronId->patronId;
+    }
+
+    public function when(): \DateTimeImmutable
+    {
+        return $this->when;
+    }
+}
diff --git a/src/Lending/Patron/Domain/PatronEvent/PatronCreated.php b/src/Lending/Patron/Domain/PatronEvent/PatronCreated.php
new file mode 100644
index 0000000..c99d815
--- /dev/null
+++ b/src/Lending/Patron/Domain/PatronEvent/PatronCreated.php
@@ -0,0 +1,51 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Akondas\Library\Lending\Patron\Domain\PatronEvent;
+
+use Akondas\Library\Common\UUID;
+use Akondas\Library\Lending\Patron\Domain\PatronEvent;
+use Akondas\Library\Lending\Patron\Domain\PatronId;
+use Akondas\Library\Lending\Patron\Domain\PatronType;
+
+final readonly class PatronCreated implements PatronEvent
+{
+    private function __construct(
+        public UUID $eventId,
+        public PatronId $patronId,
+        public \DateTimeImmutable $when,
+        public PatronType $patronType
+    ) {
+    }
+
+    public static function now(PatronId $patronId, PatronType $patronType): self
+    {
+        return new self(
+            UUID::random(),
+            $patronId,
+            new \DateTimeImmutable(),
+            $patronType
+        );
+    }
+
+    public function patronId(): PatronId
+    {
+        return $this->patronId;
+    }
+
+    public function eventId(): UUID
+    {
+        return $this->eventId;
+    }
+
+    public function aggregateId(): UUID
+    {
+        return $this->patronId->patronId;
+    }
+
+    public function when(): \DateTimeImmutable
+    {
+        return $this->when;
+    }
+}
diff --git a/tests/Fixture/BookFixture.php b/tests/Fixture/BookFixture.php
index 2b13b0a..092c310 100644
--- a/tests/Fixture/BookFixture.php
+++ b/tests/Fixture/BookFixture.php
@@ -8,16 +8,17 @@
 use Akondas\Library\Common\Aggregate\Version;
 use Akondas\Library\Common\UUID;
 use Akondas\Library\Lending\Book\Domain\AvailableBook;
+use Akondas\Library\Lending\Book\Domain\BookInformation;
 use Akondas\Library\Lending\LibraryBranch\Domain\LibraryBranchId;
 
 function restrictedBook(): AvailableBook
 {
-    return new AvailableBook(anyBookId(), BookType::RESTRICTED, anyBranch(), Version::zero());
+    return new AvailableBook(new BookInformation(anyBookId(), BookType::RESTRICTED), anyBranch(), Version::zero());
 }
 
 function circulatingBook(): AvailableBook
 {
-    return new AvailableBook(anyBookId(), BookType::CIRCULATING, anyBranch(), Version::zero());
+    return new AvailableBook(new BookInformation(anyBookId(), BookType::CIRCULATING), anyBranch(), Version::zero());
 }
 
 function anyBookId(): BookId
diff --git a/tests/Unit/Lending/Patron/Domain/CheckoutDurationTest.php b/tests/Unit/Lending/Patron/Domain/CheckoutDurationTest.php
new file mode 100644
index 0000000..5d84904
--- /dev/null
+++ b/tests/Unit/Lending/Patron/Domain/CheckoutDurationTest.php
@@ -0,0 +1,31 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Akondas\Library\Tests\Unit\Lending\Patron\Domain;
+
+use Akondas\Library\Lending\Patron\Domain\CheckoutDuration;
+use Akondas\Library\Lending\Patron\Domain\NumberOfDays;
+use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\Attributes\Test;
+use PHPUnit\Framework\TestCase;
+
+#[CoversClass(CheckoutDuration::class)]
+final class CheckoutDurationTest extends TestCase
+{
+    #[Test]
+    public function it_will_allow_for_maximum_60_days(): void
+    {
+        $this->expectException(\InvalidArgumentException::class);
+
+        new CheckoutDuration(new \DateTimeImmutable(), NumberOfDays::of(61));
+    }
+
+    #[Test]
+    public function it_will_calculate_to_timestamp(): void
+    {
+        $checkoutDuration = new CheckoutDuration(new \DateTimeImmutable('2024-06-10 10:10:10'), NumberOfDays::of(60));
+
+        self::assertEquals(new \DateTimeImmutable('2024-08-09 10:10:10'), $checkoutDuration->to());
+    }
+}