Henry II granted Lundy to the Knights Templar in 1160. The Templars were a major international maritime force at this time, with interests in North Devon, and almost certainly an important port at Bideford or on the River Taw in Barnstaple. It is likely this was because of the increasing threat posed by the Norse sea raiders, however it is unclear whether they ever took possession of the island. The Marisco family who may have been already on the island during King Stephen’s reign disputed ownership. 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.
William de Marisco was implicated in the murder of Henry Clement, one of the king's messengers, in 1235. In 1238, an attempt was made on the king's life by a man who later confessed to being an agent of the Marisco family; William de Marisco fled to the island, where he lived as a virtual king. He built a stronghold in the area now known as Bulls' Paradise with 9 feet (3 m) thick walls that safeguarded him and his 'subjects'. This triggered a concerted effort to rid the then king, Henry III, of the family. In 1242, the king sent his best men to scale the island's cliff, and William de Marisco and 16 of his accomplices were captured and tried. The king built the castle (sometimes erroneously referred to as the Marisco Castle) in an attempt to establish the rule of law on the island and its surrounding waters.
A period of anarchy followed, with English and foreign pirates and privateers—including other members of the Marisco family—taking control of the island for short periods. They found it profitable to capture the many passing Bristol merchant ships bringing back valuable goods from overseas. Because of the dangerous shingle banks in the fast flowing River Severn and Bristol Channel, with its 32 feet (10 m) tide, the second highest in the world, ships were forced to navigate close to Lundy.
Around 1645 Barbary Pirates under command of the Dutch renegade Jan Janszoon operating from the Moroccon port of Salé occupied Lundy, before he was expelled by the Penn. During this time there were reports of captured slaves, being sent to Algiers and of the Islamic flag flying over Lundy.
acLysaght the surname Lundy is from Norman de la Lounde, a name recorded in medieval documents in counties Tipperary and Kilkenny in Ireland.
