Mark was involved in going on missionary work with Paul, the 'Apostle to the Gentiles.'
Mark also authored the Gospel which bears his name.
If you are referring to St. Mark's in Venice, Italy, the Church is dedicated to him and his relics are held there.
The Eve of St. Mark was created in 1944.
St. Mark's Cemetery was created in 1773.
St. Mark Enthroned was created in 1511.
St. Mark's Hospital was created in 1835.
St Mark's Campanile was created in 1514.
St Mark's Square is in Venice.
The Belle of St. Mark was created in 1984-03.
St. Mark, as far as is known, was not married and had no children.
St. Mark the Evangelist is one of the four authors of the New Testament Gospels. The city of Venice in Italy claims him as their patron saint, and his relics are said to be housed in St. Mark's Basilica in Venice. St. Mark is traditionally believed to have been a companion of St. Peter and traveled with him to preach the Gospel.
I do not believe St. Mark was named after a school. Perhaps the school was named after St. Mark.
St Mark's Church School's motto is 'Make your mark every day'.