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May 10 in History 28 BC - A sunspot is observed by Han dynasty astronomers during the reign of Emperor Cheng of Han, one of the earliest dated sunspot observations in China. 1291 – Scottish nobles recognize the authority of …

April 12 in History 240 – Shapur I becomes co-emperor of the Sasanian Empire with his father Ardashir I. 467 – Anthemius is elevated to Emperor of the Western Roman Empire. 627 – King Edwin of Northumbria is converted to…

Typically the March equinox falls on March 20, marking the vernal point in the Northern Hemisphere and the autumnal point in the Southern Hemisphere. March 20 in History 235 – Maximinus Thrax is proclaimed emperor. 673 –…

March 19 in History 1277 – The Byzantine–Venetian treaty of 1277 is concluded, stipulating a two-year truce and renewing Venetian commercial privileges in the Byzantine Empire. 1279 – A Mongol victory at the Battle of Yamen ends…

This day marks the approximate midpoint of winter in the Northern Hemisphere and of summer in the Southern Hemisphere (starting the season at the December solstice). February 4 in History  211 – Following the death of Rome's Emperor…