The first one is actually Constantine II as Caesar, Principi Juventvs type, like
this one. Trier mint is the only mint on Wildwinds to issue this type.
The bottom one is a Beata Tranquillitas altar type of Constantine the Great, similar to
this one. The VOTIS XX altar helps pin this one down. The left-facing portrait (at least, I assume what's left of his head is facing left) is unusual, but not unheard of.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis