This comet, against which Pope Calixtus, uncle of Borgia, ordered public prayers, is the same as will reappear in 1835. [V. H.]
1456 is the correct year, and it was Halley. Pope Callixtus III died in 1458 and was later (1475) said to have excommunicated the appearance of the comet, believing it to be an ill omen for the Christian defenders of Belgrade from the besieging Ottoman armies. His actual papal bull from 1456 makes no mention of a comet. Halley did reappear in 1835, as predicted by Edmond Halley.
