diff --git a/app/activation.php b/app/activation.php
new file mode 100644
index 0000000..f79784f
--- /dev/null
+++ b/app/activation.php
@@ -0,0 +1,70 @@
+<?php
+
+namespace Aldine;
+
+add_action('after_switch_theme', function () {
+    $default_pages = [
+        'about' => [
+            'post_title' => __('About', 'aldine'),
+            // @codingStandardsIgnoreStart
+            'post_content' => apply_filters('pb_root_about_page_content', __('Pressbooks is simple book production software. You can use Pressbooks to publish textbooks, scholarly monographs, syllabi, fiction and non-fiction books, white papers, and more in multiple formats including:
+
+<ul><li>MOBI (for Kindle ebooks)</li>
+<li>EPUB (for all other ebookstores)</li>
+<li>designed PDF (for print-on-demand and digital distribution)</li></ul>
+
+Pressbooks is used by educational institutions around the world as well as authors and publishers.
+
+For more information about Pressbooks, see <a href="https://pressbooks.com/about">here</a>.', 'aldine'))
+            // @codingstandardsIgnoreEnd
+        ],
+        'help' => [
+            'post_title' => __('Help', 'aldine'),
+            // @codingStandardsIgnoreStart
+            'post_content' => apply_filters('pb_root_help_page_content', __('The easiest way to get started with Pressbooks is to follow our <a href="https://pressbooks.com/how-to-make-a-book-with-pressbooks">4 Step Guide to Making a Book on Pressbooks</a>. Or, you can review our <a href="https://guide.pressbooks.com/">Guide to Using Pressbooks</a>.
+
+If you require further assistance, please contact your network manager.', 'aldine'))
+            // @codingstandardsIgnoreEnd
+        ],
+        'catalog' => [
+            'post_title' => __('Catalog', 'aldine'),
+            'post_content' => ''
+        ],
+        'home' => [
+            'post_title' => __('Home', 'aldine'),
+            'post_content' => ''
+        ],
+    ];
+
+    if (! get_site_option('pb_aldine_activated')) {
+        // Add our pages
+        $pages = [];
+
+        foreach ($default_pages as $slug => $page) {
+            $check = get_page_by_path($slug);
+            if (empty($check)) {
+                $pages[$slug] = wp_insert_post(array_merge($page, ['post_type' => 'page', 'post_status' => 'publish']));
+            } else {
+                $pages[$slug] = $check->ID;
+            }
+        }
+
+        // Set front page to Home
+        update_option('show_on_front', 'page');
+        update_option('page_on_front', $pages['home']);
+
+        // Remove content generated by wp_install_defaults
+        if (! wp_delete_post(1, true)) {
+            return;
+        }
+        if (! wp_delete_post(2, true)) {
+            return;
+        }
+        if (! wp_delete_comment(1, true)) {
+            return;
+        }
+
+        // Add "pb_aldine_activated" site option to enable check above
+        add_site_option('pb_aldine_activated', true);
+    }
+});
diff --git a/resources/functions.php b/resources/functions.php
index a50262d..4e86ac8 100644
--- a/resources/functions.php
+++ b/resources/functions.php
@@ -65,6 +65,7 @@ array_map(function ($file) use ($sage_error) {
     'helpers',
     'setup',
     'filters',
+    'activation',
     'admin',
     'widgets',
     'widgets/latestbooks',