Tomás Óg 'na Fésóige' Mág Samhradháin, the Third, (anglicised Thomas McGovern, Junior 'of the beard') was chief of the McGovern Clan and Baron or Lord of Tullyhaw barony, County Cavan from 1408 until his death in 1458.
His ancestry was Tomás Óg 'na Fésóige' (d. 1458) son of Fearghal Mág Samhradháin (d. 1393) son of Tomás Mág Samhradháin the Second (d. 1343) son of Brian ‘Breaghach’ Mág Samhradháin (d. 1298). His father was chief of the clan. His brothers were Maol Sheachlann (died 1383), Brian (died 1427), Donnchadh Ballach (d. 1445) and Cormac.
His nickname 'na Fésóige' means "of the beard" so he must have had a very substantial beard for it to have been remarked on as it was common at the time for most men to have beards.
On the death of the McGovern chief, his uncle Maghnus 'Ruadh' Mág Samhradháin in 1408, Tomás took the chieftaincy and moved to the chief’s residence in Ballymagauran.
In 1427 his brother Brian died.
The Annals of the Four Masters for 1427 state-
Brian, son of Farrell Magauran, son of the chieftain of Teallach Eachdhach (Tullyhaw), died.
The Annals of Ulster for 1427 state-
Brian, son of Fergail Mag Samradhain, namely, son of the chief of Tellach-Eathach, eminent in charity and good hospitality, died this year with victory of penance.
His nephews were involved in fighting with the Maguire clan in 1428
The Annals of the Four Masters for 1428 state-
Hugh Oge, the son of Hugh Maguire, was slain by Mac Gillafinnen and the sons of Donough Ballagh Magauran.
The Annals of Ulster for 1428 state-