Edmund na Féasóige de Burca
Edmund na Féasóige de Búrca, 4th Mac William Íochtar (died 1458) was an Irish chieftain and noble who was lord of Lower (North) Connacht, Ireland. Edmund was the son of Thomas mac Edmond Albanach de Búrca, 2nd Mac William Íochtar (d.1402). He succeeded his brother, Walter mac Thomas de Búrca, 3rd Mac William Íochtar (d.1440), as chieftain in 1440. He was succeeded by his brother, Tomás Óg de Búrca, 5th Mac William Íochtar (d.1460).