 At the same time Hussein's eldest son Ali bin Hussein uncovered a Turkish plot to depose the Sharif in favour of Ali Haidar, head of the dispossessed Motallib branch of the Sharifian family.Hussein ordered his son Faisal to confront the Grand Vizier in Constantinople with evidence of the plot, but also to stop in Damascus to explore the viability of a revolt with the leaders of the secret societies, which he did on 26 March 1915.After a month of talks Faisal was unconvinced of the strength of the Arab movement and concluded that a revolt would not succeed without the assistance of one of the Great Powers.