Analysis of information sources in references of the Wikipedia article "Igrexa católica bizantina rusa" in Galician language version.
Some prelates, indeed, officially professed support for union with Rome. The first such was Peter Akerovych during the First Council of Lyons in 1245 [Algúns prelados, de feito, oficialmente apoiaron a unión con Roma. O primeiro deles foi Peter Akerovych durante o Primeiro Concilio de Lión 1245].