1018-4 Dagobertus; c. 603 – 19 January 639 AD king of all the Franks

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Dagobert I (Latin: Dagobertus; c. 603 – 19 January 639 AD) was the king of Austrasia (623–634), king of all the Franks (629–634), and king of Neustriaand Burgundy (629–639). He was the last king of the Merovingian dynasty to wield any real royal power.^[1] Dagobert was the first of the Frankish kings to be buried in the royal tombs at Saint Denis Basilica.

Rule in Austrasia[edit]

Dagobert was the eldest son of Chlothar II and Haldetrude (575–604). Chlothar had reigned alone over all the Franks since 613. In 623, Chlothar was forced to make Dagobert king of Austrasia by the nobility of that region, who wanted a king of their own.

When Chlothar granted Austrasia to Dagobert, he initially excluded Alsace, the Vosges, and the Ardennes, but shortly thereafter the Austrasian nobility forced him to concede these regions to Dagobert. The rule of a Frank from the Austrasian heartland tied Alsace more closely to the Austrasian court. Dagobert created a new duchy (the later Duchy of Alsace) in southwest Austrasia to guard the region from Burgundian or Alemannic encroachments and ambitions. The duchy comprised the Vosges, the Burgundian Gate, and the Transjura. Dagobert made his courtier Gundoin the first duke of this new polity that was to last until the end of the Merovingian dynasty.

Upon the death of his father in 629, Dagobert inherited the Neustrian and Burgundian kingdoms. His half-brotherCharibert, son of Sichilde, claimed Neustria but Dagobert opposed him. Brodulf, brother of Sichilde, petitioned Dagobert on behalf of his young nephew, but Dagobert assassinated him and gave the Aquitaine to his own younger sibling.^{[who?][citation needed]}

Charibert and his son Chilperic were assassinated in 632. Dagobert had Burgundy and Aquitaine firmly under his rule, becoming the most powerful Merovingian king in many years and the most respected ruler in the West. In 631, Dagobert led three armies against Samo, the ruler of the Slavs, but his Austrasian forces were defeated at Wogastisburg.^{[citation needed]}

 the nobles of Austrasia revolted under the mayor of the palace, Pepin of Landen. In 634, Dagobert appeased the rebellious nobles by putting his three-year-old son, Sigebert III, on the throne, thereby ceding royal power in the easternmost of his realms, just as his father had done for him eleven years earlier.

As king, Dagobert made Paris his capital. During his reign, he built the Altes Schloss in Meersburg (in modern Germany), which today is the oldest inhabited castle in that country. Devoutly religious, Dagobert was also responsible for the construction of the Saint Denis Basilica, at the site of a Benedictinemonastery in Paris. He also appointed St. Arbogast bishop of Strasbourg