What is Surrender and regrant?

During the Tudor conquest of Ireland , "surrender and regrant" was the legal mechanism by which Irish clans were to be converted from a power structure rooted in clan and kin loyalties, to a late-feudal system under the English legal system. The policy was an attempt to incorporate the clan chiefs into the English-controlled Kingdom of Ireland, and to guarantee their property under English common law, as distinct from the traditional Irish Brehon law system. This strategy was the primary non-violent method for Crown officials in the Dublin Castle administration to subjugate Irish clan leaders during the conquest.