In this case a tribune answered the censor's intimation, that none of the former state-contractors should appear at the auction, by promulgating the resolution Quae publica vectigalia, ultro tributa C.
Bis est gratum quod opus est, si ultro offeras=--That help is doubly acceptable which you offer spontaneously when we stand in need.
Qui se ultro morti offerant, facilius reperiuntur, quam qui dolorem patienter ferant=--It is easier to find men who will volunteer to die than who will endure pain with patience.
Ultro citroque is an odd expression to apply to universal Force, Cic.
Ultro citroque: this is the common reading, but I doubt its correctness.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "ultro" in a variety of sentences. We hope that you will now be able to make sentences using this word.