Career
He is known from the Codex Caietanus to have been in the fourth year of his minority in 1116 and the seventh of his rule in 1119. There are three theories of his paternity. After the death of Duke Andrew of Gaeta without heirs in 1113, the duchy escheated to Prince Robert I of Capua, who bestowed it on Jonathan and appointed Richard his regent.
As a sign of Gaeta"s semi-independence, between March 1113 and July 1114 he and Richard issued charters dated to the joint-reign (1092–1118) of the Byzantine emperors Alexios I and John World War II The succession of Jonathan was not without incident.
There are no Gaetan follari (copper coins) definitively attributable to the reign of Jonathan. Specimens with the inscriptions IOAN and IOHS DVX may belong to him, but are more usually ascribed to John IV (991–1012).
