Cillíne mac Forannáin (died 652) was a king of the Uí Failge, a Laigin people of County Offaly. He was the great grandson of a brother (Máel Uma) of Áed Rón mac Cathail (died 604), a previous king.[1]
He is listed as king in the Book of Leinster king list and is also mentioned in a poem in the genealogies about the royal fort at Rathangan, County Kildare.[2] His exact reign dates are uncertain. Though listed after Ailill mac Áedo Róin (died 639) in the king list; the poem mentions a king named Conaing between their reigns.[3]
He was slain in internal conflict among the Uí Failge at the Battle of Cúil Corra.[4] He was apparently succeeded by a certain Máel Dúin. Eventually his nephew Fland Dá Chongal became king.