At Tullaherin in County Kilkenny, a well dedicated to Saint David appears in exactly this way on the first edition six-inch Ordnance Survey map of 1839, its name set in those distinctive letterforms that signal something older and more charged than a simple water source.

By the time the map was revised between 1899 and 1902, the well was still there and still named, but something had changed at the site. The later map shows a pump house now standing at the location, suggesting that what had once been an open well, likely visited for devotional or curative purposes as holy wells traditionally were, had by the turn of the twentieth century been absorbed into the more practical business of water supply. The dedication to David is notable. While the name is most readily associated with the patron saint of Wales, there were early Irish saints of the same name, and wells in the Irish landscape frequently preserve dedications that are otherwise unrecorded in written sources, making them small but significant markers of local religious memory.