Serviam is Latin for "I will serve." This was the cry of St. Michael the Archangel as a response to Lucifer's "I will not serve" (Non serviam) when God put the angels to the test.
In Catholicism
Bishop Gerard L. Frey, who once headed the dioceses of Savannah, Ga., and Lafayette used it as his motto.[1]
In the Caballero de Gracia church in Madrid, there's this word up in the altar[2]
^Real Oratorio del Caballero de Gracia, Real Oratorio del Caballero de Gracia. "Real Oratorio del Caballero de Gracia". caballerodegracia.org/. RReal Oratorio del Caballero de Gracia.