The listing of the Chiefs of Leix is as follows:  (Note:mac  means son of..)

Year:       Chief:
1016       Gahan O’More, (?) lord of Leix, slain.
1017       Cearnach O’More, lord of Leix, slain.
1026       Aimergin mac Kenny mac Cearnach O’More, lord of Leix, slain.
1041       Faelan mac Aimergin O’More, lord of Leix, blinded; died in 1069.
1042       Cucogry O’More, lord of Leix, living.
1063       Lisagh mac Faelan O’More, lord of Leix, slain
1069       Macraith O’More, (?) lord of Leix, slain.
1091       Kenny O’More, lord of Leix, slain.
1097       Aimergin O’More, lord of Leix died.
1098       The son of Gahan O’More, lord of Leix, slain.
1149       Lisagh mac Aimergin mac Faelan O’More, lord of Leix, died.
1153       Neill O’More, lord of Leix, blinded.
1158       Macraith O’More, lord of Leix, living.
1183       Cucogry mac Lisagh O’More, lord of Leix, living.
1196       Donnell O’More, lord of Leix, slain.
[It is a remarkable fact the “The Irish Annals” make no mention of an
O’More, Chief of his name, during the thirteenth century]

1319       Shane mac Donough O’More, (?) lord of Leix, slain.
1342       Lisagh O’More, lord of Leix, slain.
1348       Connell O’More, lord of Leix, slain.
1354       Rory mac Connell O’More, lord of Leix, slain.
1368       Lisagh mac David O’More, (?) lord of Leix, died.
1370       Murtough O’More, (?) lord of Leix, slain.
1394       Donnell O’More, lord of Leix, living.
1398       Melaghlin O’More, lord of Leix, died.
1404       Gillpatrick O’More, lord of Leix, living.
1464       Kedagh O’More, lord of Leix, died.
1467       Donnell O’More, lord of Leix, died.
1477       The son of Owny O’More, (?) lord of Leix, slain.
1493       Connell mac David O’More, lord of Leix, slain.
1493       Neill mac Donnell O’More inaugurated lord of Leix.
1502       Melaghlin mac Owny mac Gillpatrick O’More, lord of Leix, died.
1523       Kedagh mac Lisagh O’More, lord of Leix, died.
1537       Connell mac Melaghlin mac Owny O’More, lord of Leix, died.
1538       Peirce mac Melaghlin mac Owny O’More, lord of Leix, (?) died.
1542       Kedagh roe mac Connell mac Melaghlin O’More, lord of Leix, died.
1545       Rory coach mac Connel mac Melaghlin O’More, lord of Leix, slain.
1548       Gillpatrick mac Connell mac Melaghlin O’More, lord of Leix, died.
1557       Connell og mac Connell mac Melaghlin O’More, lord of Leix, hanged.
1578       Rory og mac Rory coach mac Connell O’More, lord of Leix, slain.
1584       (circa).James mac Kedagh O’More, alias Meaghe, lord of Leix, died.
1600       Owny mac Rory og mac Rory coach O’More, lord of Leix, slain.
1600       Owny mac Shane O’More, appointed lord of Leix.”