Gwilym ap Tudur Rhys and Owain Glyndŵr. As a result, the Tudur brothers began planning an attack on Conway Castle. On Good Friday, 1 April 1401, the brothers and 44 men (which included those who had also been excluded from the pardons) infiltrated the castle. They had pretended to be carpenters, and captured the castle while the guard were in church. Negotiations began for the return of the castle on 13 April, with the king represented by Henry "Hotspur" Percy and Gwilym representing the Welsh forces. After seeking a compromise, which would have resulted in pardons being given to the Welshmen, the king
Owain Owain for the Welsh Language Society as the secretary of the first branch, at Bangor. Owain also sketched the society's logo (a red dragon's tongue) which continues to be their badge and logo. This early sketch can be seen at the National Library of Wales, Aberystwyth and on his official website (see below). Leading politician Dafydd Iwan says on his website, "He inspired my generation and laid down strong foundations on which the Welsh Language Society was built." His science fiction book entitled "Y Dydd Olaf" ("The Last Day") was described by the Welsh literary critic Pennar Davies in the book's