Question: why bijapur is name is changed to vijayapura?
Answer: And the bhamani sultan of gulbarga invaded it in 13th century. And they renamed it as Bijapur from vijayapur. ... In 10th century Kalyana Chalukyas built this city and named as Vijayapura, which means the city of victory. In 1347 Bahumani sultanate started ruling this city and then by Bijapur sultanate.