The Monothelitism reference article from the English Wikipedia on 24-Apr-2004
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Monothelitism

Monothelitism was the christological doctrine that Jesus Christ had one will but two natures (divine and human). Under the influence of the Patriarch Sergios (of Constantinople), monothelitism was developed during the reign of Heraclius as a response to Monoenergism and as an attempt to reconcile the Monophysites with the Chalcedonians. However, it was rejected by the Church, and was never accepted by most of the monophysites either. One prominent opponent of the doctrine was Maximus the Confessor, who insisted instead on dythelitism, the belief that Christ had two wills rather than one.