Shannon family genealogy
Arms: Gu. a bend or. Crest: A demi talbot sa.
COSCEACH, a brother of Cineadh (or Cendedach) who is No. 106 on the "Kennedy" (of Thomond) pedigree, was the ancestor of O'Seanchain: anglicised Shanahan, and Shannon.
106. Coscrach: son of Donchadh Cuan.
107. Flaithbeartach: his son.
108. Seanchan ("seancha": Irish, an antiquary, or genealogist): his son; a quo O'Seanchain.
109. Donchadh Dubh: his son.
110. Ruadhri: his son.
111. Donchadh: his son.
112. Aodh: his son.
113. Flaithbeartach: his son.
114. Taidhg: his son.
115. Ruadhri: his son.
116. Donchadh: his son.
117. Aodh: his son.
118. Flaithbeartach: his son.
119. Taidhg: his son.
120. Aodh O'Seanchain: his son.