A conflict occurred between the native Brehon laws and the newly imposed Norman laws over who should be the successor to Diarmait Mac Murchada as King of Leinster. After the King, passed away, the Brehon laws recognised his eldest son Domhnall Caomhánach mac Murchada through the Kings derbfine, he was the chosen Tánaist to succeed him as the king of Leinster, in keeping with the laws of Tanistry. The Norman laws however supported the Anglo-Norman leader Strongbow claim as the successor Diarmait Mac Murchada on the basis that he was married to the king’s daughter Aoife Mac Murchada. Strongbow tried to present the argument that he should inherit the title through his wife bloodlines.