Saint Matthias - May 14 and Trier, Germany.

Matthias (Koine Greek: Μαθθίας, Maththías Greek pronunciation: [maθˈθi.as], from Hebrew מַתִּתְיָהוּ Mattiṯyā́hū; Coptic: ⲙⲁⲑⲓⲁⲥ; died c. 80 AD) was, according to the Acts of the Apostles (written c. AD 80–90), the apostle chosen to replace Judas Iscariot following Judas' betrayal of Jesus and his (Judas') subsequent death. His calling as an apostle is unique, in that his appointment was not made personally by Jesus, who had already ascended into heaven, and it was also made before the descent of the Holy Spirit upon the early Church.
It is claimed that St Matthias the Apostle's remains were brought to Italy through Empress Saint Helena, mother of Emperor Constantine I (the Great); part of these relics would be interred in the Abbey of Santa Giustina, Padua, and the remaining in the Abbey of St. Matthias, Trier, Germany.