from
Bouvier's Law Dictionary, Revised 6th Ed (1856)
DE BONIS PROPRIIS. Of his own goods. When an executor or administrator has
been guilty of a devastavit, (q.v.) he is responsible for the loss which
the estate has sustained, de bonis propriis. He may also subject himself to
the payment of a debt of the deceased, de bonis propriis, by his false plea,
when sued in a representative as, if he plead plene administravit, and it be
found against him, or a release to himself, when false. In this latter case
the judgment is de bonis testatoris si, et si non de bonis propriis. 1
Saund. 336 b, n. 10 Bac. Ab. Executor, B 8.