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In page History of Pakistan:

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Mahmud's successors, known as the Ghaznavids, ruled for 157 years. Their kingdom gradually shrank in size, and was racked by bitter succession struggles. The Hindu Rajput kingdoms of western India reconquered the eastern Punjab, and by the 1160s, the line of demarcation between the Ghaznavid state and the Hindu kingdoms approximated to the present-day boundary between India and Pakistan. The Ghurid Empire of central Afghanistan occupied Ghazni around 1160, and the Ghaznavid capital was shifted to Lahore. Later Muhammad Ghori conquered the Ghaznavid kingdom, occupying Lahore in 1187.[citation needed]