Royal Arch Masons

The Royal Arch Masons is a chapter of the York Rite Freemasons. The Chapter of Royal Arch Masonry consists of four degrees: Mark Master, Past Master, Most Excellent Master, and Royal Arch Mason. The Mark Master Degree is believed to have originated as a ceremony of registering a craftsman's mark in those years distinguished by operative craft masons and their temple building.

Source: General Grand Chapter Royal Arch Masons International website