Otto de Grandson
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For the poet, see Oton III de Grandson.
Otto de Grandson[lower-alpha 1] (c. 1238–1328), sometimes numbered Otto I to distinguish him from later members of his family with the same name, was the most prominent of the Savoyard knights in the service of King Edward I of England, to whom he was the closest personal friend and many of whose interests he shared. His misrule of the Channel Islands, particularly after he left England following Edward's death, prompted greater care of the English kings when considering provision of future life estates.