Donnellan (No.1) family genealogy
Of Connaught
Arms: Ar. a fesse betw. three stags' heads caboosed gu. Crest: A greyhound sejant ar.
CATHAL, brother of Inrachtach, who is No. 98 on the "O'Beirne" pedigree, was the ancestor of O'Donallain; anglicised Donnellan, Donalan, Donelan, and Donlan.
98. Cathal: son of Muredach; a quo Clann Cathail, anglicised Charley and Charles. This Cathal was the 18th Christian King of Connaught.
99. Ardgall: his son; "died a saint at Hye, in Scotland, A.D. 786;" had a brother named Dubhionracht, who was the 22nd King of Connaught and the ancestor of O'Muireadhaigh ("muir:" Irish, the sea; "eadhach," a protector or a garment), meaning "the descendants of the man who protected the sea;" or, "who wore garments suited to the sea;" or, "sea-protector;" and anglicised Murray.
100. Ceneth: his son; had a brother named Onchu, who was the ancestor of O'Maolmocheirghe ("moch:" Irish, early, and "eirigh," to rise; Lat. "erig-o"), of Connaught, anglicised Mulmochery, Early and Eardley. (See No. 96 on the "O'Brassil West" pedigree for another O'Maolmocheirghe family.)
101. Moroch: son of Ceneth.
102. Donnallan (or little Donnall) his son; a quo O'Donallain, lords of the territory of Clann Cathail, of Connaught; had a brother named Flannagan, a quo O'Flannagain ("one of the twelve great lords of Cruaghan, in the county Roscommon"), and anglicised Flanagan.
103. Cathal (or Charles): son of Donallan.
101. Ardgal O'Donnellan: his son; first of the family that assumed this sirname.
105. Luaghlais ("luaghlais:" Irish, fetters): his son; a quo O'Luaghlais, anglicised Lawless.
106. Cathal: his son.
107. Flann Buaidh ("buaidh:" Irish, victory; Heb. "buagh," to exult): his son.
108. Amhailgadh: his son.
109. Flann (or Florence) Oge: his son.
110. Malachi: his son.
111. Cormac: his son; had a brother named Tuathal, who was the ancestor of Donnellan, of Rosse.
112. Florence: son of Cormac.
113. Teige: his son.
114. John: his son; had a brother named Tuathal Mór, who was the ancestor of Donnellan, of Ballydonnellan, Leitrim, Cloghan, etc.; and who, A.D. 1532, "built the Chapel of Kilconnell."
115. Daniel: son of John; had three brothers—1. John Oge, 2. Padraic Ruadh, 3. Amhailgadh.
116. Daniel Oge: son of Daniel.
117. Teige: his son.
118. Malachi O'Donnellan: his son.