Trustee De Son Tort Legal Definition: A person who is not a regularly appointed trustee but because of interference with the trust can be held by a court as constructive trustee which entails liability for losses to the trust. A trustee "of his own wrong". In Selangor United Rubber, the Court used these words in regards to a trustee de son tort as being one of two types of constructuve trustee: as follows "Those who, though not appointed trustees, take on themselves to act as such and to possess and administer trust property for the beneficiaries, such as trustees de son tort. Distinguishing features ... are (a) they do not claim to act in their own right but for the beneficiaries, and (b) their assumption to act is not of itself a ground of liability ... and still there is status as trustees precedes the occurrence which may be the subject of claim against them." In 1997, Canada's Supreme Court added: " To be liable as trustees de son tort, strangers to the trust must commit a breach of trust while acting as trustees. Such persons are not appointed trustees but take on themselves to act as such and to possess and administer trust property." REFERENCES: Citadel General Assurance Co. v. Lloyds Bank Canada 1997 3 SCR 805; published at canlii.org/en/ca/scc/doc/1997/1997canlii334/1997canlii334.html Duhaime, Lloyd, Legal Definition of executor de son tort. Duhaime, Lloyd, Trust Law: When Things Get Nasty, published at duhaime.org/LegalResources/ElderLawWillsTrustsEstates/LawArticle-339/Trust-Law-When-Things-Get-Nasty.aspx Selangor United Rubber Estates (Ltd.) v Cradock 1968 2 All ER 1073, at page 1095. Unless otherwise noted, this page was written by Lloyd Duhaime of Duhaime.org Always looking up definitions? Save time with our search provider (modern browsers only) If you find an error or omission in Duhaime's Law Dictionary, or if you have suggestion for a legal term, we'd love to hear from you!