Which was the first capital of ancient Mahajanapada Magadh?

Champa was the capital of which Mahajanapada?

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

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

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

Chand-Pradyota was the ruler of which ancient republic?