Definition of Ex Gravi Querela
(From or on the grievous complaint.) In old English practice, the name of a writ (so called from its initial words) which lay for a person to whom any lands or tenements in fee were devised by will (within any city, town, or borough wherein lands were devisable by custom), and the heir of the devisor entered and detained them from him. Abolished by St. 3 & 4 Wm. IV, c. 27, § 36.
That's the definition of Ex Gravi Querela in Black's Law Dictionary 6th Edition. Courtesy of Cekhukum.com.
