diff --git a/.eleventy.js b/.eleventy.js
index 5597bec..e1c27cc 100644
--- a/.eleventy.js
+++ b/.eleventy.js
@@ -142,6 +142,75 @@ module.exports = function (eleventyConfig) {
     }
   );
 
+  async function getOriginalDate(filename) {
+    try {
+      const { stdout } = await execFile("git", [
+        "log",
+        "--diff-filter=A",
+        "--follow",
+        "-1",
+        "--format=%cd",
+        filename,
+      ]);
+      return new Date(stdout);
+    } catch (e) {
+      console.error(e.message);
+      return null;
+    }
+  }
+  const originalDateCache = new Map();
+
+  eleventyConfig.addNunjucksAsyncFilter(
+    "earliestDate",
+    function (dateObj, filename, callback) {
+      const getDates = async () => {
+         let dates = [];
+
+         // 1. Frontmatter Date
+         if (dateObj instanceof Date && !isNaN(dateObj)) {
+            dates.push(dateObj);
+         }
+
+         // 2. Last Modified Date (cached)
+         let modDatePromise = lastModifiedDateCache.get(filename);
+         if (!modDatePromise) {
+            modDatePromise = lastModifiedDate(filename);
+            lastModifiedDateCache.set(filename, modDatePromise);
+         }
+         try {
+           const modDate = await modDatePromise;
+           if (modDate instanceof Date && !isNaN(modDate)) {
+             dates.push(modDate);
+           }
+         } catch(e) {}
+
+         // 3. Original Creation Date (cached)
+         let origDatePromise = originalDateCache.get(filename);
+         if (!origDatePromise) {
+            origDatePromise = getOriginalDate(filename);
+            originalDateCache.set(filename, origDatePromise);
+         }
+         try {
+           const origDate = await origDatePromise;
+           if (origDate instanceof Date && !isNaN(origDate)) {
+             dates.push(origDate);
+           }
+         } catch(e) {}
+
+         if (dates.length === 0) {
+            // Fallback if no valid dates found
+            return new Date();
+         }
+
+         // Find earliest
+         dates.sort((a, b) => a.getTime() - b.getTime());
+         return dates[0];
+      };
+
+      getDates().then(date => callback(null, date)).catch(err => callback(null, dateObj));
+    }
+  );
+
   eleventyConfig.addFilter("encodeURIComponent", function (str) {
     return encodeURIComponent(str);
   });
diff --git a/_includes/layouts/base.njk b/_includes/layouts/base.njk
index 80eddb0..5a894a1 100644
--- a/_includes/layouts/base.njk
+++ b/_includes/layouts/base.njk
@@ -106,6 +106,8 @@
 
         {% if page.url and page.url.indexOf("/posts/") > -1 %}
           <p>Published <time datetime="{{ page.date | htmlDateString }}">{{ page.date | readableDate }}</time></p>
+        {% elif page.url and page.url.indexOf("/site-index/") == -1 %}
+          <p class="published-date" style="font-style: italic; opacity: 0.5; text-align: center;">Originally published on <time datetime="{{ page.date | earliestDate(page.inputPath) | htmlDateString }}">{{ page.date | earliestDate(page.inputPath) | readableDate }}</time></p>
         {% endif %}
       </article>
     </main>
diff --git a/package-lock.json b/package-lock.json
index 5b4c1da..ef148fa 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -66,6 +66,7 @@
       "integrity": "sha512-03ER4zukR6BgwppI5DHRE11lc+8B0fWsBrqacVWo3o49QkdEFXnEWjhyI9qd9LrPlgQHK2/MYyxuOvNwecyCLQ==",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "@11ty/dependency-tree": "^2.0.1",
         "@11ty/eleventy-utils": "^1.0.1",
@@ -5468,6 +5469,7 @@
       "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.2.13.tgz",
       "integrity": "sha512-FCE5xLH+hjbzRdpbRb1IMCvPv9yZx2QnDarBEYSN0N0HYk+TcXsEhwdFcFb+SRWOKzKGErhIEbBK2ogyLdTtfQ==",
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "colorette": "^1.2.2",
         "nanoid": "^3.1.22",
@@ -6554,6 +6556,7 @@
       "resolved": "https://registry.npmjs.org/rollup/-/rollup-2.79.2.tgz",
       "integrity": "sha512-fS6iqSPZDs3dr/y7Od6y5nha8dW1YnbgtsyotCVvoFGKbERG++CVRFv1meyGDE1SNItQA8BrnCw7ScdAhRJ3XQ==",
       "license": "MIT",
+      "peer": true,
       "bin": {
         "rollup": "dist/bin/rollup"
       },