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In 1881, he moved to what was then Eastern Rumelia (since 1885 united with the Principality of Bulgaria) to work as a high-school teacher in the Bulgarian cities of Plovdiv (1882-1886), Sliven (1886-1888), Varna (1888-1890, 1894-1915) and Veliko Tarnovo (1890-1894).
Much later, after the Liberation of Bulgaria in 1878, all of Northern Bulgaria and the region of Sofia became the Principality of Bulgaria while most of the rest of Southern Bulgaria was part of Eastern Rumelia until the Bulgarian unification in 1885.
The school soon became a well known educational institution for Greek communities inside and outside the region of Eastern Rumelia (an autonomous province under Ottoman control, established in 1878 and united in 1885 with the Principality of Bulgaria) and Thrace.
As a member of the Bulgarian Secret Central Revolutionary Committee, Stranski was among the most prominent participants in the organization of the Bulgarian unification of 1885, or the accession of Eastern Rumelia to the Principality of Bulgaria.