CS Knowledge Base

1178 (MCLXXVIII) was a common year starting on Sunday of the Julian calendar, the 1178th year of the Common Era (CE) and Anno Domini (AD) designations, the 178th year of the 2nd millennium, the 78th year of the 12th century, and the 9th year of the 1170s decade. As of the start of 1178, the Gregorian calendar was 7 days ahead of the Julian calendar, which was the dominant calendar of the time.

• June 18 – Five Canterbury monks see what was possibly the Giordano Bruno crater being formed
• The Sung Document written detailing the discovery of "Mu-Lan-Pi" (suggested by some to be California) by Muslim sailors
• The Chronicle of Gervase of Canterbury written
• The Leaning Tower of Pisa begins to lean as the third level is completed