Mort D'Ancestor Law and Legal Definition

Mort d'ancestor means the death of an ancestor. It also refers to a writ of assize to recover land from an abator of which the demandant's father or mother, brother or sister, uncle or aunt, nephew or niece had died seised.

The following is an example of a case law referring to mort d'ancestor:

Where a nephew died seised of lands of which the uncle was rightful heir, but into which a stranger immediately entered, and thus ousted the uncle by abatement, his remedy was by a writ called a writ of mort d'ancestor. This writ will direct an enquiry whether the nephew died seised and whether the uncle was his lawful heir. [McCarthy v. Marsh, 5 N.Y. 263, 276 (N.Y. 1851)].