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  2. Gregorian Reform - Wikipedia

    en.wikipedia.org/wiki/Gregorian_Reform

    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 ...

  3. Inter gravissimas - Wikipedia

    en.wikipedia.org/wiki/Inter_gravissimas

    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.

  4. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    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 ...

  5. Calendar (New Style) Act 1750 - Wikipedia

    en.wikipedia.org/wiki/Calendar_(New_Style)_Act_1750

    The second part of Gregory's change declared that a centennial year would not be a leap year unless it was further evenly divisible by 400: Section II of the Act replicates this algorithm. By 1750, almost all countries in Western Christendom except Britain and its empire had already adopted Gregory's reform. [33]

  6. Dictatus papae - Wikipedia

    en.wikipedia.org/wiki/Dictatus_papae

    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 ]

  7. H. E. J. Cowdrey - Wikipedia

    en.wikipedia.org/wiki/H._E._J._Cowdrey

    The projected book, Pope Gregory VII, 1073–1085, appeared in 1998 and was considered an instant masterpiece. His last book, Lanfranc: Scholar, Monk, and Archbishop , was published in 2003. It is a study of Lanfranc of Canterbury , an Italian monk from Normandy, that seeks to show that he understood England and the needs of the English church.

  8. Adoption of the Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Adoption_of_the_Gregorian...

    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.

  9. Gregorian Reforms - Wikipedia

    en.wikipedia.org/?title=Gregorian_Reforms&...

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