
An Abbasid–Carolingian alliance was attempted during the 8th to 9th century through a series of embassies, rapprochements and combined military operations between the Frankish Carolingian Empire and the Abbasid Caliphate and pro-Abbasid rulers in Al Andalus.

The Ludwigslied is an Old High German (OHG) poem of 59 rhyming couplets, celebrating the victory of the Frankish army, led by Louis III of France, over Danish (Viking) raiders at the Battle of Saucourt-en-Vimeu on 3 August 881.

The Reconquista was a period in the history of the Iberian Peninsula of about 780 years between the Umayyad conquest of Hispania in 711, the expansion of the Christian kingdoms throughout Hispania, and the fall of the Nasrid kingdom of Granada in 1492.

The Treaty of Mersen or Meerssen, concluded on 8 August 870, was a treaty of partition of the realm of Lothair II, known as Lotharingia, 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 treaty followed an earlier treaty of Prüm which had split Middle Francia between Lothair I's sons after his death in 855.

The Treaty of Prüm, concluded on 19 September 855, was the second of the partition treaties of the Carolingian Empire. As Emperor Lothair I was approaching death, he divided his realm of Middle Francia among his three sons.

The Treaty of Ribemont in 880 was the last treaty on the partitions of the Frankish Empire. It was signed by the German king Louis the Younger and the kings of Western Francia, Louis III and Carloman.

The Treaty of Verdun, signed in August 843, was the first of the treaties that divided the Carolingian Empire into three kingdoms among the three surviving sons of Louis the Pious, who was the son of Charlemagne. The treaty, signed in Verdun-sur-Meuse, ended the three-year Carolingian Civil War.

The Viking raids in the Rhineland were part of a series of invasions of Francia by the Vikings that took place during the final decades of the 9th century. From the Rhineland, which can be regarded as the nucleus of Frankish culture, the Franks had previously conquered almost the whole of Central Europe and established a great empire.