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In page Buddhism in Central Asia:

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Other religious kings, such as the 16th century Mongol potentate Altan Khan, invited Buddhist teachers to their realm and proclaimed Buddhism the official creed of the land in order to help unify their people and consolidate their rule. In the process they may have prohibited certain practices of non-Buddhist, indigenous religions and even persecuted those who followed them, but these heavy-handed moves were primarily politically motivated. Such ambitious rulers never forced their subjects to adopt Buddhist forms of belief or worship. This is not part of the religious creed.