This is the 9025th most frequent Russian word.
ровенского
"Rовенского" relates to something or someone from Rivne, a city in Ukraine.
In this sentence, 'Ровенского' is used as a proper adjective derived from 'Ровно,' a city, forming a genitive case to describe possession of an item by a scientist from Rovno.
Этот предмет принадлежал Ровенского ученому.
This item belonged to a Roven scientific scholar.
Here, 'Ровенского' identifies a district named Roven, using the genitive case to specify a street within this area.
Мы проживаем на улице Ровенского района.
We live on a street in the Roven district.
In this usage, 'Ровенского' specifies a tradition originating from the Roven region, also in the genitive case to indicate origin.