page_title: 639
hierarchical_section_title: 639
context_page_description: Year 639 was a common year starting on Friday of the Julian calendar. The denomination 639 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.
context_section_description: Year 639 (DCXXXIX) was a common year starting on Friday (link will display the full calendar) of the Julian calendar. The denomination 639 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.
caption: The Muslim invasion of Egypt (639–642)
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