Mon arbre généalogique

LOUIS, son of Emperor LOUIS I "le Pieux" & his first wife Ermengard --- ([806]-Frankfurt-am-Main 28 Aug 876, bur Kloster Lorsch). Thegan's Vita Hludowici Imperatoris names (in order) "Hlutharius, Pippinus, Hludowicus" as sons of Emperor Louis and his wife Ermengard[14]. Under the Ordinatio Imperii promulgated by Emperor Louis in 817, Louis received "Baioariam et Carentanos, et Beheimos et Avaros, atque Sclavos qui ab orientali parte Baioariæ sunt…et duas villas…in pago Nortgaoe Luttraof et Ingoldesstat", specifying that he was to be named king[15]. He fought with his father and his brothers, joining the rebellions in 831 and 833. In the settlement of 833, he received Alemannia, Alsace and Rhetia (taken from his half-brother Charles II "le Chauve", as well as Thuringia and Saxony. His father obliged him to leave these additional territories in 839, confining his rule once more to Bavaria. Following the accession of his brother Lothaire as sole emperor after their father's death in 840, Ludwig allied himself with his half-brother Charles II "le Chauve". Together they defeated Emperor Lothaire at Fontenoy-en-Puisaye, near Auxerre 25 Jun 841. Under the partition of territories agreed under the Treaty of Verdun 11 Aug 843, Louis was installed as LUDWIG II "der Deutsche" King of the East Franks. When Charles II "le Chauve" King of the West Franks was faced with widespread rebellion, King Ludwig II invaded his kingdom in Aug 858 but was defeated 15 Jan 859 in the Laonnais and forced to withdraw. In 865, King Ludwig agreed with King Charles "le Chauve" the future division of the territories of Lothaire II King of Lotharingia, but on the latter's death in 869 King Charles invaded Lotharingia before Ludwig could assert his rights. A settlement was reached at Meerssen in Aug 870 under which Ludwig received Alsace and other territory along the Rhine[16], in effect succeeding as LUDWIG I King of Lotharingia [part]. The necrology of Prüm records the death "876 5 Kal Sep" of "Ludvicus imperator frater Ludvici imperatoris"[17]. The Liber Anniversariorum of Zurich records the death "V Kal Aug" of "Ludovicus rex fundator monasterii"[18].
m (827) EMMA, daughter of WELF [I] Graf [von Altdorf] & his wife Heilwig --- (-31 Jan 876, bur Regensburg St Emmeran). The Annales Xantenses record the marriage in 827 of "Ludewicus rex" and "sororem Iudith imperatricis" but do not name her[19]. This appears to be the only primary source in which her origin is specified. "Ludowicus…rex" made a donation to St Felix & Regula in Zurich naming "filia nostra Bertha…[et] coniugis nostræ Hemmæ" by charter dated 29 Oct 863[20]. The Annales Fuldenses record that "Hemma quoque regina" became paralysed in 874, died at Regensburg in 876 and was buried in the church of St Emmeran[21]. The necrology of Regensburg St Emmeran records the death "II Kal Feb" of "Hemma regina hic sepulta"[22]. The necrology of Augia Divis records the death "II Kal Feb" of "Hemma regina"[23]. The necrology of Nonnberg records the death "2 Kal Jan" of "Hemma imperatrix sor na"[24].
King Ludwig II & his wife had seven children

http://fmg.ac/Projects/MedLands/GERMANY,%20Kings.htm#_Toc284161544

Louis II dit le Germanique ou de Bavière (v.806-† 876), fils de Louis Ier dit le Pieux et Ermengarde de Hesbaye. En juillet 817, du vivant de son père, il reçoit la Bavière lors du premier partage de l'Empire carolingien, suite à la promulgation du capitulaire Ordinatio Imperii.

En 827, il épouse Emma de Bavière, sœur de Judith, seconde épouse de son père.

Mais à la mort de Louis le Pieux en 840, Louis doit s'allier à son demi-frère Charles II le Chauve, pour combattre Lothaire Ier leur frère aîné, qui veut les exclure du partage de l'Empire carolingien.

Le Traité de Verdun, en 843, met fin au conflit qui les oppose, et confirme la mainmise de Louis sur toute la Francie orientale, appelée aussi royaume de Germanie, sur laquelle il règne jusqu'à sa mort le 28 août 876.

http://fr.wikipedia.org/wiki/Louis_le_Germanique