Severina Empress of the Roman Empire from 270 to 275.
Ulpia Severina was a Roman Empress, the wife of the emperor Aurelian.

Very little is known about her, as there are no literary sources mentioning her existence. Almost everything known about her, including her name, is gathered from coins and inscriptions.

There is considerable numismatic evidence for Ulpia Severina ruling in her own right between the death of Aurelian and the election of Marcus Claudius Tacitus. Sources mention an interregnum between Aurelian and Tacitus, and some of Ulpia's coins appear to have been minted after Aurelian's death. As such she may have been the only woman to rule over the whole Roman Empire in her own power.
Severina
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An AE Antoninianus struck 270-275 AD in Ticinum
Obverse: SEVERINA AVG, Diademed and draped bust right on crescent.

Reverse: CONCORDIAE MILITVM, Concordia standing left holding two standards

Diameter: 23 mm
Die Orientation: 0 H
Weight: 29 g
No notes for this coin
RIC V-1 8
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An BL Antoninianus struck 275-283 A.D. in Ticinum
Obverse: SEVERINA AVG, diademed, draped bust right on a crescent

Reverse: CONCORDIAE MILITVM, Concordia standing left with two ensigns.

Diameter: 23 mm
Die Orientation: 0 H
Weight: 2.85 g
No notes for this coin
http://www.ric.mom.fr/en/coin/1561
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An AE Antoninianus struck 275 AD in Cyzicus
Obverse: diademed, draped bust on crescent right; SEVERINA AVG

Reverse: Concordia standing left, holding standard in each hand; CONCORDIAE MILITVM / XXI

Diameter: 22 mm
Die Orientation: -
Weight: 3.29 g
Cyzicus Issue 10, Phase 2, early – summer 275 AD
RIC 18; Cohen 7 http://www.ric.mom.fr/en/coin/3084