789 and before the infamous Lindisfarne raid

fig 1 Hyglac`s raid
500 Radiocarbon dating reveals that the first walls of Dannevirke was build around 480-500 and some older walls were from around 400.
528 The Frankish historian Bishop Gregor of Tours wrote about the Geatic(Goth or Jute) king Chochilacus (Hyglac) was defeated during a sea raid against the Frankish coast. The raid was mentioned in the Anglo Saxon 8th century Beowulf poem : "Our feud with the franks grew worse when Hugleik sailed with his fleet to the shores of Frisia. Frankish warriors attacked him there, and outfought him, he fell, surrounded by his retainers".

550 The Roman-Gothic author Jordanes, wrote a history book, where he mentioned the Danes, who originally came from Skandia(Scania) and were taller and bigger than all other Nordic tribes, Jordanes also mentions that they are closely related to the Svear tribe and the Danes had driven out the Heruli from their homeland. The Heruli were mentioned in 267 where they were acting as pirates in The black sea, They were in 460 in Aquitania and Galicia. A Roman poet Sidonius Apolinaris wrote that the Heruli came from an area near the most ice cold deep sea.
fig 2 Scandinavian warrior 6-7th century
fig 3 Dannevirke
fig 4 A Viking Shield maiden

The Greek Procopios a secretary at the Byzantine general Belisarius told that emperor Anastasius I Dicorus
in the year 512 gave permission to settle in Illyria(The areas east of the Adriatic sea) Because The Longobards had driven them from the area between Donau and Dniester. Here they killed their king Onchon and sent some of their people back to Thule to recruit a new king among their fellow tribesmen. They had free passage through the land of the Danes, before they arrived to the ocean.

565 A Danish-Saxon viking army raided in Western Fries-land, but was defeated by Duke Lupus of Champagne. The incident is known from a poem written by Venantius Fortunatus.

730
The Bishop of Utrecht Willibrord traveled on a Christian mission to Denmark. This was an attempt to preach in Denmark, but it failed Willibrord wrote that the Danish king Ongendus(Angantyr) was tougher than stone and wilder than an animal. though ,the preacher was treated well during his visit.

735 The Anglo Saxon historian Beda wrote that one of the tribes was named the Jutes, the Angles came from an area called Angel in Southern Jutland, Angel was desolate and empty for people after the migration.

737 King Ongendus(Angantyr) of the Danes reinforced the Dannevirke fortifications and He ordered to build a palisade rampart on the frontier of Saxony.

750 Staraja Lodaga was established

771 Charlemagne attacked the heathen Saxons and destroyed the holy tower Irminsul, Danes witness how their neighbors were suffering from Christian atrocities and had to surrender to the Frankish empire.

777 The Saxon chieftain Widukind and his war band fled to Denmark, where the Danish king Sigfred gave him and other Saxon refugees political asylum.

778 Widukind returned to Saxony to join the rebellion against Charlemagne's army, Many Danish warrior traveled with Widukind to participate in the Saxon freedom war.

782 Charlemagne crushed the Saxon rebellion , he arrived to Lippe and entered negotiations with the diplomats appointed by the Danish king Sigfred. After the withdrawal of the Frankish army, Widukind started another Saxon rebellion, and as a form of revenge Charlemagne ordered the execution of 4500 unarmed Saxon hostages in the town Verden an der Aller. This atrocity caused whole Saxony into flame and fury.

783 During two large battles Charlemagne crushed the Saxon Rebellion, after the victory Charlemagne ordered forced Christianize to all Saxons. Any association with Paganism would result in death penalty. Saxons would rebel again and Saxons kept fleeing to Denmark.

788 A Danish chieftain Olgerus(Holger Danske) was attending the court of Charlemagne, on the basis of legends about Olgerus the French poet Raimbert De Paris wrote in the 12th century the book Chevalerie Ogier, which told us about the battles against the longobards and the Saracens, when Holger Danske was part of Charlemagne's army. Holger Danske later became a Danish national hero and in 1534 Christian Pedersen used the French poem to write the book Chronicle of Holger Danske.

789 3 ships from Hordaland, Norway raided Isle of Portland on the Dorset coast, and killed a local reeve. The Anglo Saxon Alcuin, Advisor to Charlemagne wrote to a friend in Saxony "Is there any hope for a Christianize of the Danes ?", the Franks knew that the reign over Saxony was unstable until the warrior Danes had become Christian.