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This page was last edited on 22 November 2021, at 07:52 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
Year 644 was a leap year starting on Thursday of the Julian calendar. The denomination 644 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
The year 644 BC was a year of the pre-Julian Roman calendar. In the Roman Empire , it was known as year 110 Ab urbe condita . The denomination 644 BC for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.