(1) He had a relationship with Swanhilde.
Child(ren):
(2) He is married to SIBYL d'ANJOU.
They got married in the year 1134 at Lorraine, Moselle, France.
Child(ren):
Theoderic (Dutch: Diederik, French: Thierry, German: Dietrich;c. 1099 - January 17, 1168), commonly known as Thierry of Alsace, was the fifteenth count of Flanders from 1128 to 1168. He was the youngest son of Duke Theoderic II of Lorraine and Gertrude of Flanders (daughter of Robert I of Flanders). With a record of four campaigns in the Levant and Africa (including participation in the Second Crusade, the failed 1157-1158 siege of the Syrian city Shaizar, and the 1164 invasion of Egypt), he had a rare and distinguished record of commitment to crusading.
After the murder of his cousin Charles the Good in 1127, Theoderic claimed the county of Flanders as grandson of Robert I, but William Clito became count instead with the support of King Louis VI of France. William's politics and attitude towards the autonomy of Flanders made him unpopular, and by the end of the year Bruges, Ghent, Lille, and Saint-Omer recognized Theoderic as a rival count. Theoderic's supporters came from the Imperial faction of Flanders.
Louis VI of France had Raymond of Martigné, the Archbishop of Reims, excommunicate Theoderic. Louis VI then besieged Lille, but was forced to retire when Henry I of England, William Clito's uncle, transferred his support to Theoderic. However, Theoderic was defeated at Axspoele and fled to Bruges. He was forced to flee Bruges as well, and went to Aalst, where he was soon under siege from William, Godfrey I of Leuven, and Louis VI. The city was about to be captured when William was found dead on July 27, 1128, leaving Theoderic as the only claimant to the seat.
Theoderic set up his government in Ghent and was recognized by all the Flemish cities as well as King Henry, who had his Flemish lords in England swear fealty to him. Theoderic himself swore homage to Louis VI after 1132, in order to gain the French king's support against Baldwin IV, Count of Hainaut, who had advanced his own claim on Flanders.
Pilgrimage and Second Crusade
In 1132 his wife, Suanhilde, died, leaving only a daughter. In 1139 he went on pilgrimage to the crusader Kingdom of Jerusalem, and married Sibylla of Anjou, daughter of King Fulk of Jerusalem and the widow of William Clito; a very prestigious marriage. This was the first of Theoderic's four pilgrimages to the Holy Land. While there he also led a victorious expedition against Caesarea Phillippi, and fought alongside his father-in-law in an invasion of Gilead. He soon returned to Flanders to put down a revolt in the Duchy of Lower Lotharingia, ruled at the time by Godfrey III of Leuven.
Theoderic joined the Second Crusade in 1147. He led the crossing of the Maeander River in Anatolia and fought at the Battla of Attalya in 1148, and after arriving in the crusader Kingdom he participated in the Council of Acre, where the ill-fated decision to attack Damascus was made.
Theoderic participated in the Siege of Damascus, led by his wife's half-brother Baldwin III of Jerusalem, and with the support of Baldwin, Louis VII of France, and Conrad III of Germany, he lay claim to Damascus. However, the native crusader barons preferred one of their own nobles, Guy Brisebarre, lord of Beirut. According to William of Tyre, the resulting dispute contributed to the final failure of the siege: 'for the local barons preferred that the Damascenes should keep their city rather than to see it given to the count', and so did all they could to ensure the siege collapsed.
Therefore, William continues, many contemporaries blamed Theoderic for the ultimate failure of the Second Crusade (though it is notable that William himself declines to say whether he believed Theoderic responsible).
During his absence, Baldwin IV of Hainaut invaded Flanders and pillaged Artois; Sibylla reacted strongly and had Hainaut pillaged in response. The Archbishop of Reims intervened and a treaty was signed. When Theoderic returned in 1150, he took vengeance on Baldwin IV at Bouchain, with the aid of Henry I, Count of Namur and Henry II of Leez, Bishop of Liège. In the subsequent peace negotiations, Theoderic gave his daughter Marguerite in marriage to Baldwin IV's son, the future Baldwin V, Count of Hainaut.
Returns to Holy Land
In 1156 Theoderic had his eldest son married to Elizabeth of Vermandois, daughter and heiress of Raoul I of Vermandois. In 1156 he returned to the Holy Land, this time with his wife accompanying him. He participated in Baldwin III's siege of Shaizar, but the fortress remained in Muslim hands when a dispute arose between Theoderic and Raynald of Châtillon over who would possess it should it be captured. He returned to Flanders 1159 without Sibylla, who remained behind to become a nun at the convent of St. Lazarus in Bethany. Their son Philip had ruled the county in their absence, and he remained co-count after Theoderic's return. In 1164 Theoderic returned once more to the Holy Land. He accompanied King Amalric I, another half-brother of Sibylla, to Antioch and Tripoli. He returned home in 1166, and adopted a date palm as his seal, with a crown of laurels on the reverse.
Death
He died on January 17, 1168, and was buried in the Abbey of Watten, between Saint-Omer and Gravelines. His rule had been moderate and peaceful; the highly developed administration of the county in later centuries first began during these years. There had also been great economic and agricultural development, and new commercial enterprises were established; Flanders' greatest territorial expansion occurred under Theoderic.
Family
His first wife, Swanhilde, died in 1132, leaving only one daughter:
Laurette of Flanders, who married four times: 1)Iwain, Count of Aalst; 2)Henry II, Duke of Limburg; 3)Raoul I of Vermandois, Count of Vermandois; 4)Henry IV of Luxembourg. Laurette finally retired to a nunnery, where she died in 1170.
Theoderic secondly married Sibylla of Anjou, daughter of Fulk V of Anjou and Ermengarde of Maine, and former bride of William Clito. Their children were:
Philip of Flanders (died 1191)
Matthew of Alsace (died 1173), married Countess Marie I of Boulogne
Margaret I of Flanders (died 1194), married Ralph II, count of Vermandois and Valois (died 1167, son of Ralph I), and then she married Baldwin V, Count of Hainaut
Gertrude of Flanders (died 1186), married Humbert III of Savoy
Matilda of Flanders, abbess of Fontevrault
Peter of Flanders (died 1176), Bishop of Cambrai
SOURCE: Wikipedia - https://en.wikipedia.org/wiki/Thierry,_Count_of_Flanders
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