Joseph of Arimathea was a wealthy disciple of Jesus, who, according to the book of Matthew 27:57-60, asked Pontius Pilate for permission to take Jesus' dead body in order to prepare it for burial. He also provided the tomb where the crucified Lord was laid until his Resurrection. Joseph is mentioned in a few times in parallel passages in Mark, Luke and John, but nothing further is heard about his later activities.
Apocryphal legend, however, supplies us with the rest of his story by claiming that Joseph accompanied the Apostle Philip, Lazarus, Mary Magdalene & others on a preaching mission to Gaul. Lazarus & Mary stayed in Marseilles, while the others travelled north. At the English Channel, St.Philip sent Joseph, with twelve disciples, to establish Christianity in the most far-flung corner of the Roman Empire: the Island of Britain. The year AD 63 is commonly given for this "event", with AD 37 sometimes being put forth as an alternative. It was said that Joseph achieved his wealth in the metals trade, and in the course of conducting his business, he probably became acquainted with Britain, at least the south-western parts of it. Cornwall was a chief mining district and well-known in the Roman empire for its tin. Somerset was renowned for its high quality lead. Some have even said that Joseph was the uncle of the Virgin Mary and therefore of Jesus, and that he may have brought the young boy along on one of his business trips to the island. Hence the words of Blake's famous hymn, Jerusalem:
And did
those feet, in ancient time,
Walk upon England's mountains green?
Much more was added to Joseph's legend during the Middle Ages. He was gradually inflated into a major saint and cult hero, as well as the supposed ancestor of many British monarchs. He is said to have brought with him to Britain a cup, said to have been used at the Last Supper and also used to catch the blood dripping from Christ as he hung on the Cross. A variation of this story is that Joseph brought with him two cruets, one containing the blood and the other, the sweat of Christ. Either of these items are known as The Holy Grail, and were the object(s) of the quests of the Knights of King Arthur's Round Table.
Ref. Britannia
Joseph, it seems followed the trail of his ancestors by coming to the British Isles as described in the Book of leinster.