Peter III of Russia: A Detailed Biography

Peter III (1728–1762), born Karl Peter Ulrich of Holstein-Gottorp, was Emperor of Russia for just six months in 1762. Grandson of Peter the Great and Catherine I’s chosen heir, he was a Prussian-obsessed German prince who alienated the Russian elite and was overthrown by his wife Catherine the Great. His mysterious death cleared the path for one of Russia’s greatest rulers. This biography covers his German childhood, disastrous marriage, brief reign, and violent end, as documented by the Encyclopaedia Britannica, the Smithsonian Magazine, and the Hermitage Museum.

Early Life in Kiel

German Prince and Russian Heir

Born Karl Peter Ulrich on February 21, 1728, in Kiel, he was the only child of Charles Frederick, Duke of Holstein-Gottorp (Peter the Great’s nephew), and Anna Petrovna (Peter’s daughter). Orphaned at 11, he was raised by harsh tutors who beat him and made him hate Russia.

Arrival in Russia and Marriage

In 1742 Empress Elizabeth (childless) chose Peter as heir. Renamed Pyotr Fyodorovich, he arrived in St. Petersburg in 1744. In 1745 he married his second cousin Sophie Auguste Friederike of Anhalt-Zerbst — who took the name Catherine Alexeyevna. Their marriage was loveless from the start, as detailed by the History Today.

Accession and Unpopular Reign (January–July 1762)

Elizabeth died on January 5, 1762; Peter III became emperor. He immediately made peace with Prussia (his idol Frederick the Great), returning all Russian conquests from the Seven Years’ War — shocking the army and nobility.

Reforms and Alienation

Peter abolished the secret police, freed nobles from compulsory state service, secularised church lands, and promoted religious tolerance — progressive but enacted by a German-speaking Lutheran who played with toy soldiers and wore Prussian uniforms, as documented by the BBC History.

Coup by Catherine (July 1762)

On July 9, 1762 (June 28 Old Style), the Guards regiments proclaimed Catherine empress. Peter was arrested and sent to Ropsha palace.

Death

On July 17, 1762, Peter died at Ropsha — official cause “hemorrhoidal colic”. Most historians believe he was murdered by Alexei Orlov (Catherine’s lover’s brother) — strangled or beaten. Catherine’s involvement is almost certain but unproven, as detailed by the History.com.

Personal Life

Peter and Catherine’s son Paul I was born in 1754 — many believe his real father was Sergei Saltykov. Peter took mistress Elizabeth Vorontsova. He suffered from a deformity (possibly small penis) and was circumcised as an adult.

Death and Legacy

Peter III’s Enduring Impact

Peter III’s six-month reign ended the Romanov male line’s direct rule for a century (Catherine was German). His reforms — especially freeing the nobility — were kept by Catherine, who built her reputation on them. He remains one of Russia’s most reviled tsars, as analysed by the Russia Beyond.

Frequently Asked Questions About Peter III of Russia

Why Is Peter III Famous?

For his 6-month disastrous reign and overthrow by Catherine the Great.

Was Peter III Really Catherine’s Husband?

Yes — unhappy marriage 1745–1762.

Where Was Peter III Born?

Kiel, Germany, February 21, 1728.

Did Peter III Admire Frederick the Great?

Obsessively — made peace and returned conquests.

What Reforms Did Peter III Make?

Freed nobility, abolished secret police, secularised church lands.

Was Peter III Mentally Ill?

Immature and eccentric; no clear mental illness.

How Did Peter III Die?

Murdered (strangled) July 17, 1762 — likely on Catherine’s orders.