What are catus?

Some articles on catus:

Sextus Aelius Paetus Catus - Political Career
... Little is known of Paetus Catus's political career, or how he acquired the additional cognomen of "Catus" ... According to an Oxford dictionary of Roman jurists, Paetus Catus's rapid rise from curule aedile to the consulship and censorship was not due to his father's death or his elder brother's successes ... He was apparently nicknamed “catus” meaning “clever” or "the clever one" in recognition of his legal skills ...
Catus, Lot
... Catus (Catús in Occitan) is a commune in the Lot department in south-western France. ...
Aelius Catus
... Aelius Catus was a Roman commander near the Danube who, according to Strabo's geography, transplanted 50,000 Getae from what is now Muntenia in Romania far to the south of Danube, in Moesia ... Danube as early as 14 AD, when the commander Aelius Catus conducted an expedition beyond the river in order to keep away the restless Dacians and ... There has been some debate both on the identity of Aelius Catus and on the date of this action ...