Cosmas

d. 727

Byzantine usurper

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About Cosmas

Cosmas (died 727) was an unsuccessful Byzantine usurper during the reign of Leo III.

In 726/727, a revolt broke out in Hellas against the Iconoclast policies of Leo III. Cosmas was declared emperor by the rebels. The insurrection was soon crushed in April 726/7 and Cosmas was beheaded.

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Important facts

Died

727

Frequently asked questions

Who was Cosmas?

byzantine usurper

When did Cosmas die?

Cosmas died in 727.

Sources & further reading

· Wikipedia: Cosmas

· Wikidata: Q125293274

· DBpedia: Cosmas (usurper)

Cite this page

APA: Biography.guide. (2026). Cosmas. https://biography.guide/cosmas/

MLA: "Cosmas." Biography.guide, https://biography.guide/cosmas/.

Chicago: "Cosmas." Biography.guide. https://biography.guide/cosmas/.

Data last updated: 2026-09-20 · Spot an error? Report a correction.

Page generated 2026-09-27 05:33 UTC