Diem Clausit Extremum Law and Legal Definition
The phrase diem clausit extremum means he closed his last day, that is, he died. writ of Diem Clausit Extremum is a writ by which the heir of a deceased tenant in capite compelled the escheator to ascertain what land should escheat to the king.
In feudal England, upon learning the death of a tenant, the escheator would hold an inquisition post mortem to learn if the king had any rights to the land. These were often preceded by a writ of diem clausit extremum issued by the king to seize the lands.