By the 959 partition of
Lotharingia, the Luxembourg region had passed to
Frederick I, Duke of Upper Lorraine of the
House of Ardenne–Bar, a son of
Count Palatine Wigeric of Lotharingia. In 963,
Count Siegfried, probably a younger brother of Duke Frederick I, purchased some land from Abbot Wikerus of
St. Maximin's Abbey, Trier. This land was centered on a ruined (supposedly
Roman) fort by the
Old High German name of
Lucilinburhuc (commonly translated as "little castle"). In the following years, Count Siegfried had a new castle built on the site of these ruins, on a rock that would later be called
Bock Fiels. This castle dominated a stretch of the old Roman road linking
Reims,
Arlon, and
Trier, and opened some prospects for trade and taxation. Despite this new construction, it seems that Siegfried and his immediate successors did not make the castle their primary residence. The history of Luxembourg proper began with the construction of this castle. In the following years, a small town and market grew around the new castle. The first inhabitants were probably servants of Count Siegfried and clergy of
Saint Michael's church. This settlement soon received additional protection by the construction of a first, partial
city wall and
moat. In addition to the small town near
Bock Fiels and the Roman road, another settlement was formed in the
Alzette Valley (today the
Grund quarter). By 1083, this lower town contained two churches, two bridges of the rivers Alzette, and
Petruss. Its inhabitants pursued various professions, including fishing, baking and milling. That same year, the
Benedictine abbey of
Altmünster was founded by
Count Conrad on the hill behind Luxembourg castle.
Henry III was the first count known to have established his permanent residence in Luxembourg castle. In a document from the year 1089, he is referred to as
comes Henricus de Lutzeleburg, which also makes him the first documented count of Luxembourg. Around this fort, the town gradually developed and became the center of a small, but important state of great strategic value to
France,
Germany, and the
Low Countries. Luxembourg's fortress was steadily enlarged and strengthened over the years by successive owners, making the
Fortress of Luxembourg one of the strongest in continental Europe. Its formidable defenses and strategic location caused it to become known as the
Gibraltar of the North. The
House of Luxembourg provided several
Holy Roman Emperors, kings of
Bohemia, and
archbishops of
Trier and
Mainz. From the
Early Middle Ages to the
Renaissance, Luxembourg bore multiple names, including Lucilinburhuc, Lutzburg, Lützelburg, Luccelemburc, and Lichtburg, among others. ==The Duchy (1353–1797)==