*St. Hilary of Poitiers is today's optional memorial. He is labeled the "Doctor of the Divinity of Christ" and considered the first doctor of the Latin church. He lived in what is now Poitiers, France, in the 4th century. His writings focused on the Trinity and combating Arianism. He is a patron against snakes and snake bites.
Lovely quote from him, found at catholicsaints.info:
“I am well aware, almighty God and Father, that in my
life I owe you a most particular duty.
It is to make my every thought and word speak to you.
“In
fact, you have conferred on me this gift of speech, and it can yield no greater
return than to be at your service. It is
for making you known as Father, the Father of the only-begotten God, and
preaching this to the world that knows you not and to the heretics who refuse
to believe in you.
“Impart
to us, then, the meaning of the words of Scripture and the light to understand
it, with reverence for the doctrine and confidence in its truth. Grant that we may express what we believe”
(HoP, Sermon on the Trinity)
(Picture traced from pinterest to http://hillary-365alive.blogspot.com/2013/01/day-14-11413-celebrate-feast-of-st.html)