The Mariscos were fined, and the island was cut off from necessary supplies. Evidence of the Templars' weak hold on the island came when King John, on his accession in 1199, confirmed the earlier grant. In 1235 William de Marisco was implicated in the murder of Henry Clement, a messenger of Henry III. Three years later, an attempt was made to kill Henry III by a man who later confessed to being an agent of the Marisco family. William de Marisco fled to Lundy where he lived as a virtual king. He built a stronghold in the area now known as Bulls' Paradise with thick walls. In 1242, Henry III sent troops to the island. They scaled the island's cliff and captured William de Marisco and 16 of his "subjects". Henry III built the castle (sometimes referred to as the Marisco Castle) in an attempt to establish the rule of law on the island and its surrounding waters. In 1275 the island is recorded as being in the Lordship of King Edward I but by 1322 it was in the possession of Thomas, 2nd Earl of Lancaster and was among the large number of lands seized by Edward II following Lancaster's execution for rebelling against the King.At some point in the 13th century the monks of the Cistercian order at Cleeve Abbey held the rectory of the island. Over the next few centuries, the island was hard to govern. Trouble followed as both English and foreign pirates and privateers – including other members of the Marisco family – took control of the island for short periods. Ships were forced to navigate close to Lundy because of the dangerous shingle banks in the fast flowing River Severn and Bristol Channel, with its tidal range of , one of the greatest in the world. This made the island a profitable location from which to prey on passing Bristol-bound merchant ships bringing back valuable goods from overseas. In 1627 a group known as the Salé Rovers, from the Republic of Salé (now Salé in Morocco) occupied Lundy for five years. These Barbary Pirates, under the command of a Dutch renegade named Jan Janszoon, flew an Ottoman flag over the island. Some captured Europeans were held on Lundy before being sent to Algiers to be sold as slaves. From 1628 to 1634 the island was plagued by pirate ships of French, Basque, English and Spanish origin. These incursions were eventually ended by Sir John Penington, but in the 1660s and as late as the 1700s the island still fell prey to French privateers.