The early history of British expansion in India was characterised by the co-existence of two approaches towards the existing princely states. The first was a policy of annexation, where the British sought to forcibly absorb the Indian princely states into the provinces which constituted their Empire in India. The second was a policy of indirect rule, where the British assumed paramountcy over princely states, but conceded to them sovereignty and varying degrees of internal self-government. During the early part of the 19th century, the policy of the British tended towards annexation, but the Indian Rebellion of 1857 forced a change in this approach, by demonstrating both the difficulty of absorbing and subduing annexed states, and the usefulness of princely states as a source of support. In 1858, the policy of annexation was formally renounced, and British relations with the remaining princely states thereafter were based on subsidiary alliances, whereby the British exercised paramountcy over all princely states, with the British crown as ultimate suzerain, but at the same time respected and protected them as allies, taking control of their external relations. The exact relations between the British and each princely state were regulated by individual treaties and varied widely, with some states having complete internal self-government, others being subject to significant control in their internal affairs, and some rulers being in effect little more than the owners of landed estates, with little autonomy.