Founder of the Dominican Order (1170–1221)
St Dominic
Dominic de Guzmán, almost exclusively known as Saint Dominic, was a Castilian religious priest and the founder of the Order of Preachers (Dominicans).
He is the patron saint of astronomers and natural scientists, and he and the Dominicans are traditionally credited with spreading and popularizing the rosary.
Text adapted from Wikipedia, CC BY-SA 4.0. Photograph: Krzysztof Golik (see Commons), Wikimedia Commons.