Eustacius (died 1241) was a 13th-century Irish Roman Catholic bishop."A New History of Ireland" Moody, T.W; Martin, F.X; Byrne, F.J;Cosgrove, A: Oxford, OUP, 1976
Previously Archdeacon of Connor,"Fasti Ecclesiae Hibernicae: The succession of the prelates Volume 3" Cotton, H. p257 Dublin, Hodges & Smith, 1848-1878 he was elected bishop in 1226 and received possession of the temporalities on the 5th of May that year.
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