Champa was the capital of which Mahajanapada?

Which was the first capital of ancient Mahajanapada Magadh?

During the period of 16 Mahajanapadas, Mathura was the capital of –

Which one among the following mahajanapadas in ancient India was an oligarchy?

Which ruler had made Pataliputra the capital of his empire for the first time?

Chand-Pradyota was the ruler of which ancient republic?