Pedrigee of Crowleys/O’Crowleys (Ó Crualaoich:Hard Hero/Warrior) West Cork, from Carew manuscript.
Dr. Edward McLysaght, the genealogist, has the Crowleys as a Sept of The McDermotts of Moylurg, Roscommon and migrating to West Cork c 12th Century. Presumably they were Mercenaries. DNA matches of the Crowley support this with families from that area turning up.
In the 1641 Depositions the claims of Planters for damage due to the Uprising there are frequent references to members of the extended family.