St. Mark the Evangelist has been venerated since early Christian times, especially in the Coptic Orthodox Church. His feast day is celebrated on April 25th in the Western Christian tradition and on the 30th of Baouna in the Coptic Orthodox Church.
Yes, he is a great Saint.
St. Joseph, the Adopted father of the Christ, was venerated as a Saint very early in the Christian Church.
St Peter was formally cannonized in 1980. His feast day is September 24.
Trasilla and Emiliana were aunts of St. Gregory the Great and they were venerated as virgin saints in the sixth century.
If you are referring to St. Mark's in Venice, Italy, the Church is dedicated to him and his relics are held there.
St Theodosius made Christianity the official religion of the Roman Empire and was venerated for his sanctity.
St. Patrick is not venerated as a martyr, so it is not correct to assert that he was killed. He is assumed to have died a natural death. He is venerated as the apostle of Ireland because he was instrumental in spreading the Christian faith 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.