hi! there's always room for more input, but there have been similar questions in the past, so check these out
What is Romania's connection to the Romans?
How did the region that has developed into modern Romania develop a Romance based language and not a slavic one like Bulgaria?
Is there an historic reason why Romanians consider themselves Latin but the bordering countries who also were part of the Roman Empire do not?
How come Romanian is a latin language? The country was under roman domination for less than 200 years and not entirely ( around 20% of its territory).
Why does Romania speak a Romance language but none of the rest of Eastern Europe does? which links to this quite old thread How did it end up that Romanian, a romance languge, is spoken in n area completely surrounded by slavic/hungarian, cut off from all other romance languages?