Based off of old Klingon D6 Cruisers, the Romulans purchased many of them to convert into KRV Carriers when it was found that their existing carrier vessels simply could not carry enough fighter shuttles into battle.

Extremely effective as both a carrier and a warship, the KRV Carriers served with distinction for decades. Once fighter shuttles proved overly ineffectual in the modern combat world the KRV's were scrapped.