Today we celebrate the Feast of St Mark, Evangelist. He is the author of the Gospel of Mark. Readings are here.
More information is here. Something I did not know until I read that is "In AD 43, about 10 years after the ascension of Christ, Mark traveled to Alexandria and founded the Church of Alexandria, which today is claimed by the Coptic Orthodox Church. Aspects of the Coptic liturgy can be traced back to Saint Mark himself. He became the first bishop of Alexandria and he is honored as the founder of Christianity in Africa."