St. Tarcisius - His story, for children. By Clifford Stevens.
Catholic Encyclopedia: St. Tarsicius - Roman martyr of the third or early fourth century. St. Tarsicius was carrying the Blessed Sacrament on his person, and refused to surrender it when beset by a pagan mob.
Tarsicius of Rome - Says that St. Tarsicius was martyred around the year 255.