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Inter gravissimas (English: "Among the most serious...") was a papal bull issued by Pope Gregory XIII on 24 February 1582. [1] [2] The document, written in Latin, reformed the Julian calendar. The reform came to be regarded as a new calendar in its own right and came to be called the Gregorian calendar, which is used in most countries today.
Gregory VII's ban on lay investiture was a key element of the reform, ultimately contributing to the centralized papacy of the later Middle Ages. [7] The reform of the church, both within it, and in relation to the Holy Roman Emperor and the other lay rulers of Europe, was Gregory VII's life work. It was based on his conviction that the church ...
The Gregorian reform shortened the average (calendar) year by 0.0075 days to stop the drift of the calendar with respect to the equinoxes. [3] Second, in the years since the First Council of Nicaea in AD 325, [ b ] the excess leap days introduced by the Julian algorithm had caused the calendar to drift such that the March equinox was occurring ...
By 1750, almost all countries in Western Christendom except Britain and its empire had already adopted Gregory's reform. [ 33 ] According to Gregory's rule, the year 1600 was a leap year, but 1700 was not—but it remained a leap year under the Julian calendar.
The principles expressed in Dictatus Papae are mostly those expressed by the Gregorian Reform, which had been initiated by Gregory decades before he became pope. It does not mention key aspects of the reform movement such as the abolishing of the triple abuse of clerical marriage, lay investiture and simony. [ 2 ]
Things named for Pope Gregory VII: The Gregorian Reform, a series of reforms initiated by Pope Gregory VII and the circle he formed in the papal curia, c. 1050–80, which dealt with the moral integrity and independence of the clergy; Things named for Pope Gregory XIII: Gregorian calendar, internationally the most widely used civil calendar ...
Wednesday, 2 September 1752, was followed by Thursday, 14 September 1752. In Great Britain, the term "New Style" was used for the calendar and the Act omits any acknowledgement of Pope Gregory: the Annexe to the Act established a computation for the date of Easter that achieved the same result as Gregory's rules, without actually referring to him.
The Decretals of Gregory IX (Latin: Decretales Gregorii IX), also collectively called the Liber extra, are a source of medieval Catholic canon law. In 1230, Pope Gregory IX ordered his chaplain and confessor , Raymond of Penyafort , a Dominican , to form a new canonical collection destined to replace the Decretum Gratiani , which was the chief ...