In Latin, Caius is an archaic spelling of the Latin praenomen Gaius, pronounced /ga:ius/. In early Latin, the letter C was used for both /g/ and /k/; and the names Gaius and Gnaeus were spelt Caius and Cnaius and continued to be so in inscriptions, after the letter G was introduced, and C was confined to the /k/ sound. Notably, the name of Gaius Iulius Caesar is abbreviated CIC.

","content","

In English, Caius is a latinized spelling of the last name of John Keys of Gonville and Caius College, Cambridge.\n

Caius may refer to:\n

\n\n

People

Given name

\nAncient world\n

Pope Caius (died 296), Bishop of Rome and martyr
Caius (bishop of Milan), bishop of Milan in the early 3rd-century, saint
Caius (presbyter), early 3rd century Christian writer
Caius Largennius (died c. 50), Roman legionary

\nModern era\n

Caius of Korea (1571–1624), Catholic missionary, one of the Martyrs of Japan
Caius Brediceanu (1879–1953), Romanian politician and diplomat
Caius Gabriel Cibber (1630–1700), Danish sculptor
Caius Iacob (1912–1992), Romanian mathematician and politician
Caius Lungu (1989–2025), Romanian footballer
Caius Novac (1821–?), Romanian footballer
Caius Welcker (1885–1939), Dutch footballer

Surname

Jean Ferdinand Caius (1877–1944), French botanist and naturalist who worked in India
John Caius the Elder (fl. 1480), English poet
John Caius (1510–1573), English physician and second founder of Gonville and Caius College, Cambridge
Thomas Caius (died 1572), English academic and administrator, Fellow and Master of University College, Oxford

Fictional characters

In Shakespeare's plays

Caius, in the play King Lear, the name that the Earl of Kent takes when in disguise
Caius, the protagonist in Coriolanus
Caius Lucius, Roman ambassador and later general in Cymbeline
Doctor Caius, a French doctor in The Merry Wives of Windsor
Caius, a casual nomer used in Camus’ play “Caligula” to refer to the tyrannical emperor of the same name.

Other

Caius

Broadcast History