Background
Mykhailo Olsavszky was born on about 1700 in the village of Oľšavka, Spišská Nová Ves District, from which he took his surname (which originally was Išid).
Mykhailo Olsavszky was born on about 1700 in the village of Oľšavka, Spišská Nová Ves District, from which he took his surname (which originally was Išid).
At the death of his predecessor, he was appointed, on 8 February 1743 as general vicar by the Latin bishop of Eger: actually at that time, following the Union of Uzhhorod, the eparch of Mukacheve was formally an apostolic vicar of such Latin diocese. In a few months he was elected to such position by the clergy, designated by the Empress Maria Theresa and so confirmed by Pope Benedict XIV on 5 September 1743. He received the titular see of Rhosus and was consecrated bishop on 9 December 1743 by the bishop of Făgăraş, Inocenţiu Micu-Klein.
A few time before consecration, Mykhailo Olsavszky entered in the Order of Saint Basil the Great and took the religious name of Manuil.
In 1746 Manuil Olsavszky was requested by Empress Maria Theresa to undertake a pastoral visit in Transylvania that was at the time without Byzantine bishop due to the exile of Micu-Klein. He again returned in Transylvania in 1761 to cross, with his authority and predication, the disturbance of the Orthodox monk Sofronie.
In 1756 he complete and consecrated the sanctuary of Máriapócs which was started by his predecessor Gennadius Bizanczy. To serve sanctuary, he built a monastery and assigned it to the Basilian monks.
He also buily schools in Mukachevo and in Máriapócs for the instruction of the clergy, and succeeded to obtain the necessary economical grants.
While his predecessors in Mukachevo lived in the Saint Nicholas Monastery, on request of the monks he built an episcopal residence in downtown. In 1764 he built, with his own money, a school of theology and one for cantors in Mukachevo. However the jurisdictional situation of his eparchy, formally an apostolic vicariate under the Latin bishop of Eger, was not satisfactory.
So Manuil Olsavszky contested the authority of the Bishop of Eger and tried to persuade Empress Maria Theresa to gave full independence to the eparchy.
He could not see the results of his work, but four years after his death, in 1771, the Eparchy of Mukacheve got its independence. Manuil Olsavszky died in Mukachevo on 5 November 1767, and he was buried in the sanctuary of Máriapócs.
Among his works, we can remember his Sermon et orientale de Sacra eccidentalem inter Unione quo ecclesia episcopus Rossensis.