[1] The decree of election was presented to Pope Urban IV by Roger de Castello, a canon of Aberdeen.
The election was declared contrary to canon law, but the Pope took into account the poverty of the diocese of Caithness with the costs of the journey to Rome from such a distant diocese, and delegated the authority to judge the fitness of Walter to the Bishops of Dunkeld, Brechin and Ross.
It is known he received a subsidy from the king taken from the profits of justice in the province.
[3] According to Clan Mackay tradition, Aodh Mór MacAoidh (or Iye Mackay), married a daughter of Bishop Walter, acquiring 12 davochs of land at Durness.
[4] His death was followed, after some delay, by the election of Nicholas, Abbot of Scone.