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In page Eleanor of Viseu:

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After her brother Manuel I succeeded to the throne in 1495, Eleanor moved to the palace of Xabregas, where she hosted the royal court and continued to be socially active.[citation needed] For a short period between 1500 and 1502, Eleanor's brother Manuel found himself childless, and Eleanor herself became the heir to the throne. As she had no children, she declined to make the oath as an heir in favour of her sister Isabel.[citation needed]