Ro Britianrus was a wooden sailing ship commissioned by the Kingdom of Bloxland in the late 13th century. It is most famous for carrying Erik Cassel I, Maximus Mormutball Sr., and Henry I on their expedition to North Bloxmerica in 1290–1291. This journey, which led to the discovery of the eastern shore of which is now known as the United States of Robloxia, marked a significant moment in the exploration and expansion of Ro Britain's influence.
The ship was constructed in the coastal city of Lankforth and was launched in mid-1290 after nearly two years of design and construction. According to several historical accounts and writings, the ship was part of a three-vessel fleet commissioned by the Ro British monarchy, who aimed to expand Ro Britain's territorial claims and to establish new trade routes. Though the Ro Britianrus faced challenges such as storms and harsh conditions during the journey, it successfully brought its crew to the coast of Robloxia, where they established the first settlements and began mapping the newly discovered land.