Two lords – Theobald V, Count of Blois, son of the Count of Champagne, and Geoffrey, Count of Nantes ( brother of Henry II, Duke of Normandy ) – tried to kidnap Eleanor to marry her and claim her lands on Eleanor's way to Poitiers.

Eleanor and Henry were cousins to the third degree through their common ancestor, Ermengarde of Anjou ( wife to Robert I, Duke of Burgundy and Geoffrey, Count of Gâtinais ); they were also both descendants of Robert II of France.

Richard was to be appointed the Count of Poitou with control of Aquitaine, whilst Geoffrey was to become the Duke of Brittany.

13th-century depiction of Henry II of England | Henry II and John's siblings: ( l to r ) William IX, Count of Poitiers | William, Henry the Young King | Henry, Richard I of England | Richard, Matilda of England, Duchess of Saxony | Matilda, Geoffrey II, Duke of Brittany | Geoffrey, Eleanor of England, Queen of Castile | Eleanor, Joan of England, Queen of Sicily | Joan and John

With his primary heir dead, Henry rearranged the plans for the succession: Richard was to be made King of England, albeit without any actual power until the death of his father ; Geoffrey would retain Brittany ; and John would now become the Duke of Aquitaine in place of Richard.

The death of Henry's fourth son, Geoffrey II, Duke of Brittany in 1186 began a new round of disputes, as Henry insisted that he retain the guardianship of the duchy for his unborn grandson Arthur I, Duke of Brittany.

He was also an elder brother of Geoffrey II, Duke of Brittany ; Leonora of England, Queen of Castile ; Joan of England ; and John, Count of Mortain, who succeeded him as king.

Finally, in 1183 Henry the Young King and Geoffrey, Duke of Brittany invaded Aquitaine in an attempt to subdue Richard.

* 1158 – Geoffrey II, Duke of Brittany ( d. 1186 )

Bellême's overlord was the king of France, but Domfort was under the overlordship of Geoffrey Martel and Duke William was Alençon's overlord.

Duke of Normandy, married Sybil of Conversano, daughter of Geoffrey of Conversano.

* Geoffrey II, Duke of Brittany

* Geoffrey V, Count of Anjou and Duke of Normandy

* September 23 – Geoffrey II, Duke of Brittany ( d. 1186 )

* August 19 – Geoffrey II, Duke of Brittany ( b. 1158 )

Eleanor was the daughter of Duke Geoffrey II of Brittany, elder brother of King John, which meant that she had a better claim to the English throne than John and Henry according to Primogeniture, thus should have been queen regnant in 1203.

In exchange for being recognised as Duke of Normandy by Louis, Geoffrey surrendered half of the Vexin — a region considered vital to Norman security — to Louis.

In Geoffrey of Monmouth's Historia Regum Britanniae ( c. 1136 ), Gorlois Duke of Cornwall puts his wife Igraine in Tintagol while he's at war ( posuit eam in oppido Tintagol in littore maris: " he put her in the oppidum Tintagol on the shore of the sea ").

* Lady Constance – widow of Geoffrey II, Duke of Brittany

He had one older brother, William IX, Count of Poitiers ( d. 1156 ), and his younger siblings included Matilda, Duchess of Saxony ; Richard I of England ; Geoffrey II, Duke of Brittany ; Eleanor, Queen of Castile ; Joan, Queen of Sicily ; and John of England.

Geoffrey V ( 24 August 1113 – 7 September 1151 ), called the Handsome () and Plantagenet, was the Count of Anjou, Touraine, and Maine by inheritance from 1129 and then Duke of Normandy by conquest from 1144.

Duke of Normandy, married Sybil of Conversano, daughter of Geoffrey of Conversano.

* Geoffrey II, Duke of Brittany ( 1158 – 1186 ), Duke of Brittany, third surviving legitimate son of Henry II

* 1713 – Charles I, Duke of Brunswick-Wolfenbüttel ( d. 1780 )

* 1557 – Frederick I, Duke of Württemberg ( d. 1608 )

* Albert I, Duke of Brunswick-Lüneburg ( 1236 – 1279 ) second Duke of Brunswick-Lüneburg

* Albert I, Duke of Prussia ( 1490 – 1568 ), first Duke of Prussia

Albert the Bear (; c. 1100 – 18 November 1170 ) was the first Margrave of Brandenburg ( as Albert I ) from 1157 to his death and was briefly Duke of Saxony between 1138 and 1142.

Albert was a loyal vassal of his relation, Lothar I, Duke of Saxony, from whom, about 1123, he received the Margraviate of Lusatia, to the east ; after Lothar became King of the Germans, he accompanied him on a disastrous expedition to Bohemia in 1126, when he suffered a short imprisonment.

Albert was chosen as his successor early in 1511 in the hope that his relationship to his maternal uncle, Sigismund I the Old, Grand Duke of Lithuania and King of Poland, would facilitate a settlement of the disputes over eastern Prussia, which had been held by the Order under Polish suzerainty since the Second Peace of Thorn ( 1466 ).

He married secondly to Anna Maria ( 1532 – 20 March 1568 ), daughter of Eric I, Duke of Brunswick-Lüneburg, in 1550.

He was elected Grand Duke of Lithuania on the death of his father ( 1492 ), and King of Poland on the death of his brother John I Albert ( 1501 ).

By the age of twenty, Ferdinando I, Duke of Mantua, began commissioning works from him, and he was also employed by local jewelers for figurative designs.

* Afonso, 1st Duke of Braganza, son of John I of Portugal.

* Afonso, Duke of Porto, son of Louis I of Portugal.

* Alfonso I d ' Este, Duke of Ferrara during the time of the War of the League of Cambrai.

* Alfonso I d ' Este, Duke of Ferrara ( 1476 – 1534 )

In the summer of 1214, Andrew had a meeting with Grand Duke Leszek I of Poland and they agreed that they would divide the Principality of Halych between Hungary and Poland.

However, Andrew denied to transfer the agreed territories to Duke Leszek I who made an alliance with Prince Mstilav of Novgorod and they drove away Andrew's troops from the principality.

Andronikos III was first married, in 1318, with Irene of Brunswick, daughter of Henry I, Duke of Brunswick-Lüneburg ; she died in 1324.

This provision was repealed in 1716, at the request of George I, who was also the Elector of Hanover and Duke of Brunswick-Lüneburg of the Holy Roman Empire, and so frequently needed and wanted to stay in Hanover.

* 1578 – Duel of the Mignons claims the lives of two favourites of Henry III of France and two favorites of Henry I, Duke of Guise.

* 1290 – Leopold I, Duke of Austria ( d. 1326 )

* 1574 – Cosimo I de ' Medici, Grand Duke of Tuscany ( b. 1519 )

An accord was made between him and the Bohemian Duke Borivoj I ( reigned 870-95 ); Bohemia was thus freed from the dangers of invasion.

In 1600 he was called to Parma by Duke Ranuccio I Farnese to began the decoration of the Palazzo del Giardino, but he died before it was finished.