Closely akin to the subject of changelings is that of adults or well-grown children being led away to live with the Tylwyth Teg. In this field the Welsh traditions are innumerable, and deal not only with the last century or two, but distinctly with the middle ages. Famed among British goblins are those fairies which are immortalised in the Tale of Elidurus. This tale was written in Latin by Giraldus Cambrensis (as he called himself, after the pedantic fashion of his day), a Welshman, born at Pembroke Castle, and a hearty admirer of everything Welsh, himself included. He was beyond doubt a man of genius, and of profound learning. In 1188 he made a tour through Wales, in the interest of the crusade then in contemplation, and afterwards wrote his book--a fascinating picture of manners and customs in Wales in the twelfth century.