Why is th Kilwinning Lodge called as No 0?

Mother Kilwinning Lodge holds the roll number 0 under the Grand Lodge of Scotland as the result of a historic compromise resolving a dispute over seniority with The Lodge of Edinburgh (Mary's Chapel) 1.

Under the Schaw Statutes of 1599, Mary's Chapel had been designated as the first head lodge of Scotland and Kilwinning second, an article on the Grand Lodge of Scotland's website notes. Following the formation of the Grand Lodge of Scotland in 1736, Mother Kilwinning objected to being ranked behind Mary's Chapel on the Grand Roll, claiming precedence as the oldest lodge in Scotland, as an article on the Grand Lodge of Scotland's website explains.

This disagreement led Mother Kilwinning to secede from the Grand Lodge in 1743 and operate independently, issuing its own lodge charters, an article on the Grand Lodge of Scotland's website records. When Mother Kilwinning returned to the Grand Lodge of Scotland in 1807, the two bodies settled the issue of antiquity by placing Mother Kilwinning at the head of the roll as No. 0 1, allowing Mary's Chapel to retain its designation as Lodge No. 1 while acknowledging Kilwinning's claim to ancient precedence, an article on the Grand Lodge of Scotland's website notes.