Giolla Íosa Mág Samhradháin, (died 1231) was chief of the McGovern Clan and Baron or Lord of Tullyhaw barony, County Cavan from about 1181 to 1231.
The Annals of the Four Masters 1231 state- Gilla-Isa Magauran, Lord of Tealach Eachdhach died.
[4] The Annals of Loch Cé 1231 state- Gilla-Isa Mac Shamhradhain, dux of Tellach-Echach, quievit.
[5] The Annals of Connacht 1231 state- Gilla Isa Mac Samradain, chieftain of Tullyhaw, rested.
[6] His son was Giolla na Naomh Mág Samhradháin (the Second), who was chief of the clan from 1231 – c.1240.