San Pietro in Montorio stands as a significant historical site in Rome, commissioned by the Spanish monarchs Ferdinand and Isabella. This church is believed by tradition to mark the exact spot where St. Peter was crucified, making it an important destination for visitors interested in Christian history.
San Pietro in Montorio holds special meaning for Irish visitors. The church is the final resting place of three Gaelic Chiefs who fled Ireland during the Flight of the Earls in 1607. Their graves serve as a reminder of a pivotal moment in Irish history and offer a unique link between the cultures of Ireland and Italy.
Source - https://en.wikipedia.org/wiki/San_Pietro_in_Montorio