More Anglo-German Marriage Connections and Geneaology Fun
When the German king Heinrich the Fowler looked for a suitable bride for his son Otto (912-979), he contacted King Æthelstan of Wessex who sent two of his-half sisters on a visit. Otto, the future Duke of Saxony and King of East Francia, would make a fitting brother-in-law for the king of Wessex, and both Æthelstan and Otto shared an enemy in the Danes who had that habit of making unannounced visits to the coasts of England and northern Germany. For the young House of the Liudolfings on the other hand, a daughter of Edward the Elder and granddaughter of Alfred the Great would support their claim to the kingship. After all, the West Francian Carolingians still presented some competition.

Magedburg Cathedral, sculpture form 1250, likely depicting Otto I and Eadgytha
Otto decided for Editha (Eadgytha) who was said to have been of royal bearing and sweet disposition (1). The marriage took place in 930 and Editha got the income from the bishopric of Magdeburg as morning gift. Her tomb was discovered in the cathedral of Magdeburg in November 2008.
Heinrich the Fowler died in 936, and Otto I became King of East Francia. But it took until 962 before he was crowned Emperor of the Holy Roman Empire as well.
The daughter of Otto and Editha, Liutgard (931-953), married Konrad of Lotharingia, the ancestor of the Salian Royal House - he was the great grandfather of Konrad II, the first Salian Emperor (1027). Konrad II in turn was grandfather of Heinrich IV (1050-1106), the one who got into so much trouble with the pope in Rome (see my list of German Emperors).
Heinrich IV's daughter Agnes of Waiblingen married Friedrich I Duke of Swabia of the House Staufen, their son Friedrich II of Swabia married Judith, daughter of Heinrich the Black, Duke of Bavaria (1075-1126) of the Welfen family (2). Their son would later be known as Emperor Friedrich Barbarossa (1122-1190).
Heinrich IV's son Heinrich V, a charming young man who took his own father captive in order to get the throne, was was married to Maud (Mathilda), daughter of Henry I of England, who after his death married Geoffrey of Anjou. She was the grandmother of Richard Lionheart and Mathilda, the wife of Henry the Lion.
Heinrich the Black's son Heinrich the Proud married Gertrud, daughter of the Emperor Lothar of Süpplingenburg; their son was Heinrich the Lion, Duke of Saxony and Bavaria (1129-1195). That makes Heinrich the Lion and Friedrich Barbarossa cousins, and members of the two most powerful families in Germany. Heinrich the Lion married Mathilda of England, daughter of Henry II and Eleanor of Aquitaine, in 1168 (3).

The Coronation, from the Helmarshausen Manuscript (showing Heinrich the Lion and Mathilda of England
The Welfen lost the power struggle with the Staufen after Otto IV died, but the family exists until today. Georg Ludwig of the House Braunschweig-Lüneburg, Prince Elector of the Holy Roman Empire and King of Hannover (4), ascended the English throne as George I in 1714. He was not closest in line to the English throne, but he was the closest Protestant.
Notes
1) Editha's sister Eadgifu married King Charles III (879-929) of West Francia who got into so much trouble with the nobles of his realm that he ended his days in the dungeons of one of them. Eadgifu and her son Louis fled to England. He would return to France and become king under the name of Louis IV d'Outre-Mer in 936, with the help of Duke Hugo 'the Great' who was married to another of Eduard's daughters, Edhilda. Louis in turn married Otto's sister Gerberga.
2) Heinrich the Black was the son of Welf IV - the one who had divorced Ethelind of Northeim when he supported Emperor Heinrich IV against Otto of Northeim - and Judith of Flanders, a daughter of Balduin IV and widow of Tostig Godwinson Earl of Northumbria who fell at Stamford Bridge in 1066.
3) Their youngest son Wilhelm of Lüneburg (also known as William of Winchester) would continue the family.
4) House Hannover was a cadet branch of House Braunschweig (Brunswick)-Lüneburg; at the time the only surviving branch of the family.