Historical eventJanuary 111055

Theodora Porphyrogenita

Theodora Porphyrogenita became the sole ruler of the Byzantine Empire after the death of her brother-in-law Constantine IX Monomachos.

Everything on January 11Original source

In context

When
Wednesday, January 11 1055971 years ago
Category
Historical eventA dated happening — a battle, treaty, launch, discovery, disaster or decision — recorded on this calendar day.
Era
11th century · 1050s
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 1055.

What happened

Theodora Porphyrogenita became the sole ruler of the Byzantine Empire after the death of her brother-in-law Constantine IX Monomachos.

January 11 through the years

Other entries on the same calendar day, in order.

  1. 1055Theodora Porphyrogenita
  2. 1986Sir Leo Hielscher Bridges
  3. 1994Republic of Ireland
  4. 1995Intercontinental de Aviación Flight 256
  5. 1996Space Shuttle program
  6. 1998Sidi-Hamed massacre
  7. 2003Governor of Illinois
  8. 2003Jon Burge
  9. 2013Bulo Marer hostage rescue attempt
  10. 2020COVID-19 pandemic in Hubei
  11. 2024North Korean migrant workers

Sources

Cite this page

“Theodora Porphyrogenita”, What's On This Date, https://whatsonthisdate.com/app/event/theodora-porphyrogenita-1055-january-11, accessed October 28, 2026.

Cite the underlying source as well — the source links above go to the record this entry is adapted from.

Questions about this entry

When did Theodora Porphyrogenita happen?

January 11 1055 — 971 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?

Wikipedia “On this day” feed. Summaries are short adaptations that link back to the source, not reprints.

How do I cite this page?

Use the ready-made citation near the sources at the bottom of the page, and follow the source link to cite the underlying record as well.

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