The literature on the German Nikodemus Frischlin - a prominent 16th century figure, humanist, educator, philologist, poet, astronomer and rector of the Protestant Estates School in Ljubljana - is relatively rich. In the 16th century, the nobility began to realise that schooling could open up new possibilities for their sonsć livelihoods. At that time, the Protestant Estates School developed into a kind of higher-level Latin school. In Ljubljana, where it began in 1563, it achieved a new increase in quality with the arrival of Nikodemus Frischlin, advancing to a five-year programme. Frischlin was even contemplating a sixth year (with some university study subjects), although this was not realised. Although his school plan from 1584 was generally well received (the first gymnasium in Slovenia), he had a number of reasons for not being satisfied in Ljubljana. On 1 August 1584, he left the school and, in late August, he departed Ljubljana for Tübingen, while the Slovenes were left with the lasting fruit of his labours, i.e. the third school plan (called Frischlinćs school plan) of the Protestant Estates School in Ljubljana, which among other things shows a desire for the independent resolution of school issues and independent educational ideas in Slovenia.