In the centuries that followed, a cultural and military "Gaelic revival" eventually came to cover the larger portion of the island. The majority of Norman barons eventually adopted Irish culture and language, married in with the native Irish, and adopted Irish legal custom. By the 15th century, in the areas outside of the English controlled Pale around Dublin, and some notable areas of joint tradition in northern and eastern Munster, Brehon law became the de facto legal writ. Nevertheless, the Brehon Laws could never be adopted on an official basis by the English-controlled government of the Lordship of Ireland, although some modernised concepts have been readopted in the laws of the Republic of Ireland. The imposition of the Statutes of Kilkenny in 1367 and the policy of Surrender and regrant effectively outlawed Brehon Law. In one exceptional case, vestigial rights have been recognised in recent Irish case law, in reference to the survival of Brehon law-governed customary local fishery rights in Tyrconnell, but these also amounted to an easement under Common Law. The Tudor conquest of Ireland in the mid-16th century, ending in the Nine Years' War (1594–1603), caused Tanistry and Gavelkind, two cornerstones of the Brehon Laws, to be specifically outlawed in 1600. The extension of English law into Ulster became possible and led in part to the Flight of the Earls in 1607. Elements of Brehon law operated in dwindling remnants in the Gaeltacht in the west of Ireland and in the Scottish Isles, notable on the isle of Lewis. On Lewis, the chiefs of the Morrison clan (earlier, Clann mhic Amhlaigh (Macaulays) of Uig in Lewis, and Sliochd a' Bhreitheimh, later Morrison) continued to hold office as hereditary brieves (Scots for or brehon) or judges of the MacLeod clan of Lewis into the 17th century. The last Morrison to exercise the office was put down with Letter of Fire and Sword in about 1619. It is probable that it was the last operative in Lewis by about 1595 or so. See the later history of Clan Morrison. Fictional references and Ulster cycle of legends The Brehon laws play a large role in the Sister Fidelma series of historical (7th century AD) crime books by Peter Tremayne, and in those of Cora Harrison's Mara, Brehon (investigating judge) of the Burren (early 16th century). They are also the underlying principles seen in such Irish saga as Táin Bó Flidhais