I did not receive your letter of the 30th ultimo till the 2nd inst.
On the 5th and the 12th ultimo I did myself the honor of addressing you from Madrid.
Sir: I have received your letters of the 10th, 11th, and 17th ultimo.
Dear Sir,—About eight days ago I was honored with your favor of the 20th ultimo.
Continued along the foot of the table land, and halted at our camp of the 10th ultimo.
I left New York the 2d ultimo; the ship bound to that port was not then arrived.
I write only to acknowledge the receipt of the letter your Excellency did me the honor to write on the 28th ultimo.
I have received the letter, which you did me the honor to write to me on the 31st ultimo.
My dear Sir,—Your letter of the 27th ultimo was duly received, and for it please accept my thanks.
Dear Pierrepont: Yours of the 30th ultimo strikes me all wrong.
"in the month preceding the present," 1610s, common in abbreviated form ult. in 18c.-19c. correspondence and newspapers, from Latin ultimo (mense) "of last (month)," ablative singular masc. of ultimus "last" (see ultimate). Earlier it was used in the sense of "on the last day of the month specified" (1580s). Contrasted with proximo "in the next (month)," from Latin proximo (mense).