Perhaps the most impactful act of Pope Nicholas was, in the year 866, he ordered that all Christians should abstain from eating the "flesh, blood, or marrow" of warm-blooded animals on Wednesdays and Fridays. This led to the tradition still widely followed by Roman Catholics in the modern day of abstaining from eating meat on Fridays during the liturgical season of Lent, but the meat of cold-blooded animals (such as fish) still being eaten. While there is a theory that this tradition was instituted solely to benefit the fishermen of Europe, there is no evidence for this.
perhaps the most impactful act of pope nicholas was in the year 866 he ordered that all christians should abstain from eating the "flesh blood or marrow" of warm-blooded animals on wednesdays and fridays this led to the tradition still widely followed by roman catholics in the modern day of abstaining from eating meat on fridays during the liturgical season of lent but the meat of cold-blooded animals (such as fish) still being eaten while there is a theory that this tradition was instituted solely to benefit the fishermen of europe there is no evidence for this