It sounds like you're asking about the marriages of Dasharatha, the king from the Ramayana.
King Dasharatha had three main wives:
Kausalya
She was the chief queen.
Mother of Rama.
Kaikeyi
Known for playing a major role in Rama's exile.
Mother of Bharata.
Sumitra
Known for her wisdom and calm nature.
Mother of Lakshmana and Shatrughna.
So, Dasharatha had three wives, and each played an important role in the story of the Ramayana.