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He turned the former provincial city of Ghazni into the wealthy capital and extended up to today's Iran, Afghanistan as well as Pakistan and North-West India. His first campaign was against the Qarakhanid Empire in 999.
He invaded Indian subcontinent but he never kept a permanent presence such as Nagarkot, Thanesar, Mathura, Kanauj, Kalinjar, Somnath, Maheshwar, Jwalamukhi, Narunkot and Dwarka.