Máel Ísu II is the sixth alleged Bishop of the Scots, equivalent to latter day St. Andrews.
He is mentioned in the bishop-lists of the 15th-century historians Walter Bower and Andrew of Wyntoun as the successor of Cellach II.
[1] We have no direct dates for Máel Ísu II's episcopate, but the indirect evidence for his predecessors suggests that he was bishop in the late 10th and/or early 11th century.
[2]