What you will see are the actual publication dates of the web page under the title in Google search results as in the above screenshot.
But, it is reliable and easy when you just need to type one word. The next extension does this job for you with a press on the mouse.
Chrome: Right-click on the webpage you want to find the date for. Finitimus (beta) is a handy little browser add-on that can do it for you with a click. The quick check is useful when the webmaster excludes the date of publication from the page you are reading.
Use advanced Google search operators to search for your forefathers.
Again, you may need to combine it with other advanced Google search tactics.
To Google’s credit, they have improved the algorithm a lot.