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Treaty of Meerssen

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Title: Treaty of Meerssen  
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Subject: Carolingian Empire, Meerssen, West Francia, History of Europe 2, Gerolf of Holland
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Treaty of Meerssen

Division after the treaties of Verdun and Prüm (855)
Division after the Treaty of Mersen (870)

The Treaty of Meerssen or Mersen, concluded on 8 August 870, was a treaty of partition of the realm of Lothair II by his uncles Louis the German of East Francia and Charles the Bald of West Francia, the two surviving sons of Emperor Louis I the Pious. The empire of Louis the Pious, son of Charlemagne, had originally split in three parts by the 843 Treaty of Verdun, whereas his eldest son Lothair I received the Imperial crown and the personal realm of Middle Francia, while:

     Louis († 876), the second born son, received East Francia (which would evolve into the Kingdom of Germany)

     Charles the Bald († 877), his half-brother, received West Francia (which would evolve into the Kingdom of France)

Upon the death of Lothair I in 855, his realm of Middle Francia was partitioned between his sons by the Treaty of Prüm:

     Louis II († 875), the eldest son, received the imperial crown and Italy

     Charles († 863) became King of Provence (Lower Burgundy and Provence proper)

     Lothair II († 869) received Austrasia (the central part still controlled by his father after Verdun), Frisia and Upper Burgundy - this realm came to be named Lotharii Regnum (Lotharingia)

Lothair II ceded the southeastern parts of Upper Burgundy to his brothers, whereas Charles of Provence received the bishoprics of Belley and Tarentaise in 859, and Louis II of Italy the bishoprics of Geneva, Lausanne and Sion a year later. Charles of Provence suffered from epilepsy and died heirless in 863, and his kingdom was partitioned between his brothers. Lothair II, his heir, received only the western Lower Burgundian parts (bishoprics of Lyon, Vienne, Vivarais and Uzès) which were bordering his western Upper Burgundy (remnants of his original Burgundian possessions), while Louis II received the whole rest of the Kingdom of Provence.

Map of the Carolingian Empire showing lower levels of administrative division

Lothair II died in 869 without legitimate children so his heir was his brother, Emperor Louis II of Italy. As Louis was at that time campaigning against the Emirate of Bari, his uncles, Louis the German and Charles the Bald, took his inheritance. Charles had himself crowned in Metz the same year, but was forced by his brother to partition the short-lived Lotharingia, together with the lands Lothair II acquired after the death of Charles of Provence, as they had agreed at Metz in 868.

The Carolingian Empire 843-888

Their contract of 870 at Meerssen replaced the 843 Treaty of Verdun, after which the Carolingian Empire was also split into three parts, by dividing the northern half of Middle Francia stretching from the Rhone valley to the North Sea, in effect recombining sundered territories of Francia into two larger east and west divisions. However, at this time large parts of the Frisian coast were under Viking control and therefore only divided on paper. The borderline ran roughly along the rivers Meuse, Ourthe, Moselle, Saone and Rhone. In the north, Louis received most of Lothair's Austrasia, with his eastern part including both Aachen and Metz, and most of Frisia. But in the south,

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