Mongol invasion of Kievan Rus'

Historical eventMay 311223

Mongol invasion of Kievan Rus'

Mongol invasion of Kievan Rus': Mongol forces defeated a Kievan Rus' army at the Battle of the Kalka River in present-day Ukraine.

Everything on May 31Original source

In context

When
Wednesday, May 31 1223803 years ago
Category
Historical eventA dated happening — a battle, treaty, launch, discovery, disaster or decision — recorded on this calendar day.
Era
13th century · 1220s
Calendar
Julian — as recorded at the time
Recorded from
Wikipedia “On this day” feed

Dates before 15 October 1582 are in the Julian calendar, so the weekday shown follows the Julian reckoning of the time.

At a glance

Dates: From 1223.

What happened

Mongol invasion of Kievan Rus': Mongol forces defeated a Kievan Rus' army at the Battle of the Kalka River in present-day Ukraine.

May 31 through the years

Other entries on the same calendar day, in order.

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Also in 1223

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Sources

Cite this page

“Mongol invasion of Kievan Rus'”, What's On This Date, https://whatsonthisdate.com/app/event/mongol-invasion-of-kievan-rus-1223-may-31, accessed October 29, 2026.

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Questions about this entry

When did Mongol invasion of Kievan Rus' happen?

May 31 1223 — 803 years ago, on a Wednesday.

Is this a Julian or a Gregorian date?

It is the date as recorded at the time, on the Julian calendar. The Gregorian equivalent falls about ten days later; sources from different countries may give either.

Where does this text come from?

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