Check this valuable resource for Irish marriages that occurred between 1771 and 1812.
Title: Irish marriages, being an index to the marriages in Walker's Hibernian magazine, 1771 to 1812, by Henry Farrar, 1897.
Volume 1 (Surnames A-J) Alt link: https://archive.org/stream/irishmarriagesbe01farr#page/n10/mode/1up
Volume 1 (Surnames K-Z) Alt link: https://archive.org/stream/irishmarriagesbe02farr#page/n10/mode/1up