Joannes

Joannes
Solidus of Joannes marked: d·n· iohannes p·f· aug·
Roman emperor in the West (unrecognized in the East)
Reign	20 November 423 – May 425
Predecessor	Honorius
Successor	Valentinian III
Eastern emperor	Theodosius II
Died	c. May 425 Aquileia
Names Iohannes

Joannes or John (Latin: Iohannes; died 425) was Western Roman emperor from 423 to 425.

On the death of the Western emperor Honorius, Theodosius II, the last remaining ruler of the Theodosian dynasty, did not immediately announce a successor. In the interregnum, the patrician Castinus elevated Joannes as emperor. Theodosius refused to accept the decision, and deposed Joannes in a civil war.