Sebes (margrave) dating history

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Meanwhile his [Stephen's] bodily strength began to fail, and feeling himself overcome with a great lassitude he sent in haste a messenger, namely Buda, the son of Egiruth, charging him that Vazul, the son of his uncle, should be taken from the prison of Nitra where the king had shut him up that he might amend his youthful wantonness and folly, and should be brought to him in order that before his death he might appoint him king. Hearing this, Queen Gisela contrived a plan with Buda, who was an evil man, and in the greatest haste she sent a messenger, whose name was Sebus, son of that same Buda, to the prison in which Vazul was held. Arriving there before the messenger of the king, Sebus put out Vazul's eyes and filled the cavities of his ears with lead, and fled to Bohemia.