The city of Riva is one of the High Cities of Alera. It is ruled by the contemporary High Lord and Lady of the House of Rivus; during the Codex Alera series, the city and surrounding regions/terriories are ruled by High Lord Rivus Grantus and his wife, High Lady Rivus.
The House of Rivus[]
As he seat of the House of Rivus, the city of Riva and it's surrounding teretories share the House of Rivus's colours; Scarlet and Gold.