4to; 295x200 mm.; [2] leaves, half-page woodcut on title page, large woodcut on last page, woodcut initial. Disbound, as issued, with slight traces of having been in a binding for some time. Fine copy on crisp paper.
Bull “Ad ecclesiae regime” with which Pope Pius IV reopened the work of the Ecumenical Council of Trent. Elected pope on 26 December 1559, Pius IV was crowned on 6 January 1560 and on 29 November 1560 he published the bull convening the council fathers in Trento.
FLAVIO RURALE Pio IV Papa In: Dizionario Biografico degli Italiani.