Pope Gregory XIII
1502 CE–1585 CE · Italy (Soncino/Bologna)
Born Ugo Boncompagni, Gregory XIII trained as a jurist at Bologna and served as a papal diplomat before his election. He is remembered above all for the Gregorian calendar, introduced by the 1582 bull Inter gravissimas, which corrected the drift of the Julian system and remains the global civil standard. A vigorous promoter of the Counter-Reformation, he founded numerous colleges and seminaries, including the Roman College's expansion and national colleges for training clergy. His pontificate also drew controversy: he celebrated news of the St. Bartholomew's Day massacre of French Huguenots, a reaction historians widely note as a stain on his record.
Did you know?
The pope who deleted ten days from the calendar
In 1582 Pope Gregory XIII reformed the calendar to correct the drift the old Julian system had let build up in the seasons. Under the new Gregorian calendar, Thursday 4 October 1582 was followed directly by Friday 15 October 1582 — so ten dates, the 5th through the 14th, simply never existed. That calendar is the civil standard used worldwide today.
How we know
Papal bull Inter gravissimas (1582); Thursday 4 October 1582 was followed by Friday 15 October 1582, dropping ten days while keeping the weekday cycle unbroken.
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Italy (Soncino/Bologna)איטליהItaly
We know they were here, but the specifics of what they did at this stop aren’t recorded yet in our corpus.
About Italy (Soncino/Bologna)
Renaissance-era Italian Jewish printing and exegesis; Sforno and Abarbanel both lived in Italy.
In Italy (Soncino/Bologna) at the same time
In the same place & time
Sages whose lives overlapped with Pope Gregory XIII’s in the same cities, drawn from their recorded journeys.
The world in their lifetime
Thinkers, teachers, and rulers whose lives overlapped with Pope Gregory XIII’s — a glimpse of the wider world they lived in. Drawn purely from recorded birth and death years.
Christian world
- Pope Paul III· 1468 CE–1549 CE
- Pope Paul IV· 1476 CE–1559 CE
- Pope Clement VII· 1478 CE–1534 CE
- Martin Luther· 1483 CE–1546 CE
- Bartolomé de las Casas· 1484 CE–1566 CE
- Huldrych Zwingli· 1484 CE–1531 CE
- Pope Julius III· 1487 CE–1555 CE
- Thomas Cranmer· 1489 CE–1556 CE
- Thomas Müntzer· 1489 CE–1525 CE
- Martin Bucer· 1491 CE–1551 CE
- William Tyndale· 1494 CE–1536 CE
- Menno Simons· 1496 CE–1561 CE
- Philip Melanchthon· 1497 CE–1560 CE
- Conrad Grebel· 1498 CE–1526 CE
- Heinrich Bullinger· 1504 CE–1575 CE
- John Calvin· 1509 CE–1564 CE
- John Knox· 1514 CE–1572 CE
- Teresa of Ávila· 1515 CE–1582 CE
- Theodore Beza· 1519 CE–1605 CE
- Pope Leo XI· 1535 CE–1605 CE
- John of the Cross· 1542 CE–1591 CE
- Robert Bellarmine· 1542 CE–1621 CE
- Richard Hooker· 1554 CE–1600 CE
- Jacobus Arminius· 1559 CE–1609 CE
Luminaries & Explorers world
Scientists
Jewish world
Islamic world
Rulers world
- Bayinnaung· 1516 CE–1581 CE
- Selim II· 1524 CE–1574 CE
- Jiajing Emperor· 1507 CE–1567 CE
- Titu Cusi Yupanqui· –1571 CE
- Cosijopii I (Don Juan Cortés Cosijopii)· 1502 CE–1563 CE
- Humayun· 1508 CE–1556 CE
- Suleiman the Magnificent· 1494 CE–1566 CE
- Ivan IV the Terrible· 1530 CE–1584 CE
- Charles V (Holy Roman Emperor)· 1500 CE–1558 CE
- Oda Nobunaga· 1534 CE–1582 CE
- Túpac Amaru· 1545 CE–1572 CE
- Sayri Túpac· –1561 CE
- Toyotomi Hideyoshi· 1537 CE–1598 CE
- Henry VIII· 1491 CE–1547 CE
Works
No works attributed in the corpus yet.