Иоанн II с 01.09.1092 (источник у меня не указан). Константин Дука, видимо, до 01.09.1092.
probability to 1 September 1092. This date certainly marked the opening of a new indictional (ie fiscal) cycle, and probably also the occasion of the coronation of the young John II (half a Comnenus, half a Ducas) as co-emperor,
http://books.google.com.ua/books?id=xjxoAA...ved=0CDUQ6AEwAg
...eldest son John on 1 September 1092, also the beginning of a new indictional year and cycle, and for believing John II to have crowned his eldest son...
http://books.google.com.ua/books?id=NN1xNd...092%20-&f=false
believing Alexius I to have crowned his eldest son John on 1 September 1092, also the beginning of a new indictional year and cycle, and for believing John II to have crowned his eldest son Alexius on 1 September 1119, the beginning of a new indictional year but admittedly not a cycle...
...to have occurred on 1 September 1092 (much like the coronation of John's own son and heir Alexius on 1 September 1119).
coronation of Alexius' eldest son and heir apparent John (born 1088), and this has been very plausibly reckoned to have occurred on 1 September 1092 (much like the coronation of John's own son and heir Alexius on 1 September 1119).
Catalogue of the Byzantine coins in the Dumbarton Oaks Collection ... - Страница 547
Dumbarton Oaks, Michael F. Hendy, Alfred Raymond Bellinger - 1999 -