This is the 16388th most frequent Russian word.
римлянам
"To the Romans" (dative plural form of "римляне" - "Romans").
In this sentence, 'римлянам' (to the Romans) is used in the dative case to express the idea of importance or necessity directed toward the Romans.
Римлянам было важно сохранять свою культуру и обычаи.
It was important for the Romans to preserve their culture and traditions.
Here, 'римлянам' (to the Romans) is in the dative case indicating the indirect object of the verb 'to tell'.
Мы рассказали римлянам о наших путешествиях.
We told the Romans about our travels.
In this sentence, 'римлянам' (to the Romans) is used in the dative case to indicate the recipient of the action (given tips).