overthrow of Habsburg rule and the proclamation of a short-lived polity, the United Belgian States. Some historians have seen it as a key moment in the formation of a Belgian nation-state, and an influence on the Belgian Revolution of 1830. Seventeen and Seven Provinces Holland, Flanders and 15 other counties, duchies and bishoprics in the Low Countries were united as the Seventeen Provinces in a personal union during the 16th century, covered by the Pragmatic Sanction of 1549 of Holy Roman Emperor Charles V, which freed the provinces from their archaic feudal obligations. In 1566, Philip II of Spain, heir of Charles V, sent an army of Spanish mercenaries to suppress political upheavals to the Seventeen Provinces. A number of southern provinces (Hainaut, Artois, Walloon Flanders, Namur, Luxembourg and Limburg) united in the Union of Arras (1579), and begun negotiations for a peace treaty with Spain. In response, nine northern provinces united in the Union of Utrecht (1579) against Spain. After the Flanders and the Brabant where reconquered by Spain, the remaining seven provinces (Frisia, Gelre, Holland, Overijssel, Groningen, Utrecht and Zeeland) signed 2 years later the declaration of independence of the Seven United Provinces. Since then, several ships of the Royal Netherlands Navy have bared that name. Names from tribes of the pre-Migration Period Belgae The nomenclature Belgica is harking back to the ancient local tribe of the Belgae and the Roman province named after that tribe Gallia Belgica. Although a derivation of that name is now reserved for the Kingdom of Belgium, from the 15th to the 17th century the name was the usual Latin translation to refer to the entire Low Countries, which was on maps sometimes heroically visualised as the Leo Belgicus. Other use: Lingua Belgica: Latinized name for the Dutch language in 16th century dictionaries, popular under the influence of Humanism Belgica Foederata: literally "United Belgium", Latinized name for the Dutch Republic (also known as United Netherlands, Northern Netherlands or United Provinces), after the northern part of the Low Countries declared its independence from the Spanish Empire Belgica Regia: literally "King's Belgium", Latinized name for the Southern Netherlands, remained faithful to the Spanish king Nova Belgica: Latined name for the former colony New Netherland Fort Belgica: fort built by the Dutch in the Indonesian Banda Islands in the 17th century. United Belgian States: also known as "United Netherlandish States" () or "United States of Belgium",