John Tankard (also known as Donatus) was Bishop of Killala.

Formerly, Archdeacon of the diocese"Fasti Ecclesiae Hibernicae: The succession of the prelates Volume 3" Cotton, H. p85. Dublin, Hodges & Smith, 1848–1878 he was elected on 13 June 1306, he was consecrated in 1307. He died in 1343.

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