My grandfather gave me a piece of land. The deed of gift contains

Yes. If the inalienability clause has the effect of prohibiting you from selling or giving away the property you have received, it is always possible for your creditors to register mortgage on the donated property (Civ. 1e, Oct. 9, 1985, n°84-13.306 regarding a mortgage Judicial and Civ. 1e, June 25, 1980 regarding a legal hypothec). However, as long as the clause applies, the property given cannot be seized (Civ. 1e, 8 Feb. 2000, n°97-20.727).