Ugonio, Flavio Alessio (16th century) from Italy wrote "De solitudine", published in Venice in 1545. Ortelius refers in his Brixiani map (Ort123) to a letter by Ugonio to Cardinal Poole about which we do not know anything.
Letter to Cardinal Poole: Ort123.13.
Ulloa, Alonso de (16th century) translated Pedro Antonio Beuter’s history of Valencia into English in 1556.
Ulloa, Franciscus (16th century) from Spain explored the Gulf of California from Acapulco, Mexico in 1539. His reports were published by Ramusio.
Ort9.36, 10.36, 11.39, 12.8.
Ulpianus, Domitius (early third century A.D.) was a famous Roman lawyer who made a public career and was murdered in 228 by a praetorian guard because of political scheming.
Ort218.30, 228.12.
Ursinus Fulvius see Fulvius Ursinus.
Urstisius Christianus (born 1544) from Basel, Switzerland wrote a Basel Chronicle (Ort114), published in Basel in 1577.
Treatise on Basel: Ort114.8.
Utensicus, Victor (16th century) wrote "Historia persecutionis vandalicæ", published in 1516.
Ort218.14, 218.26.
Uticensis, Dionysius see Dionysius Uticensis.