From Duty runs Rivers of GoldThe Cades are, by Westerosi standards, a very young house. Having served the Twins for generations as household knights, they were granted the ruined holding of Castle Tarrow not long after the Targaryen Conquest. Lord Ondrew, the first Cade Lord of Castle Tarrow, took the bee as his personal sigil after finding hives thriving within the ruined walls of the ancient keep, and the banner has since overtaken the old sword-and-shield crest that the house had previously sported.
Through patience, leal service to the Freys, and enough good luck, the Cades have succeeded in restoring much of Castle Tarrow to a respectable state. Though some towers remain in poor condition, and an expanse of underground ruins remain wild and uncharted, the Cades now hold a strong fortress, and are foremost among the bannermen of House Frey.
The house words, From Duty runs Rivers of Gold, stresses the importance of diligence and obedience to one's lord. Taking the example of the hives that are kept in the castle courtyard, many Cades stress the symbiotic relationship between bees and beekeeper, between lord and vassal. Service rendered well and true brings success to the family.
A note on Castle TarrowPictured above, Castle Tarrow, despite mostly being of new construction, sits on a site that has been fortified since man first walked the Riverlands. The First Men ruled petty kingdoms from hillforts there, and the Andals likewise after their coming. Many castles were raised and fell over thousands of years, and their remains can still be found in the sunken caves beneath Castle Tarrow, more cave than stone after the passage of so much time.
The original Castle Tarrow was raised and held held by a minor Andal house which nonetheless held great sway over the region between the Twins and Seaguard. They resisted the Stormlords tooth and nail, rebelling at every possible chance. Harwyn Hoare, having snatched the Riverlands after trouncing the Stormlanders at Fairmarket, found them equally vexing. His humor being black, and his army strong, he tore Castle Tarrow to pieces, torching its buildings and wiping out its house.
The borderlands between the Mallister and Frey holdings remained lordless and disputed for two generations. When Aegon the Conqueror took his throne, however, he adjudicated the matter among his tour to reforge the Riverlands, dividing the land between the two competing houses. The Freys granted their portion- and the shredded remains of Castle Tarrow- to House Cade, who have since rebuilt the fortress into a formidable redoubt.