Lothair II
Lothair II (835 –) was the king of Lotharingia from 855 until his death.
He was the second son of Emperor Lothair I and Ermengarde of Tours.
He was married to Teutberga (died 875), daughter of Boso the Elder.
Bertha, daughter of Lothair II
Bertha( 863- 8 – March 925 in Lucca) was countess of Arles by marriage to Theobald of Arles, and margravine of Tuccany by marriage to Adalbert II of Tuscany.
She served as regent of Lucca and Tuscany from 915 until 916 during the minority of her son Guy of Tuscany.
She was described as beautiful, spirited, and courageous, and her influence over her spouse was, coupled with ambition, attributed to have involved her husbands in many wars.
She was the second illegitimate daughter of Lothair II, King of Lotharingia, by his concubine Waldrada.
Teutberga
Teutberga( died 11 November 875) was a queen of Lotharingia by marriage to Lothair II.
She was a daughter of Bosonid Boso the Elder and sister of Hucbert, the lay- abbot of St. Maurice's Abbey.
Hermann II, Count Palatine of Lotharingia
Hermann II( born 1049; died Dalhem, 20 September 1085), Count Palatine of Lotharingia 1064 – 1085.
He was count in the Ruhrgau and the Zulpichgau, as well as count of Brabant.
According to Egon Kimpen he was the son of Henry I of Lotharingia( † 1061) and Mathild of Verdun( † 1060), daughter of Gozelo I of Lotharingia, but the basis for this has been questioned.
In 1080 he married Adelaide of Weimar- Orlamünde( † 1100), widow of Adalbert II, Count of Ballenstedt.
She was a daughter of Otto of Orlamünde, count of Weimar and margrave of Meissen in Thuringia, and Adela of Brabant.
Together they had two children who had died by 1085.
He is assumed to have been the last Count Palatine of Lotharingia of the Ezzonian dynasty.
He was killed in a duel with Albert III, Count of Namur, near his castle in Dalhem( County of Limburg).
His widow married again, her third husband being Henry of Laach, count in the Mayfeldgau, who became the first count palatine of the Rhine between 1085 and 1087.
Waldrada of Lotharingia
Waldrada was the mistress, and later the wife, of Lothair II of Lotharingia.
Adolf I of Lotharingia
Adolf I of Lotharingia, count of Keldachgau, Vogt of Deutz from 1008 until 1018, was the son of Hermann I" Pusillus"( the Little Pfalzgraf), count palatine of Lotharingia.
He left three sons:
Adolf II of Lotharingia
Adolf II of Lotharingia( 1002 – 1041) was count in Keldachgau and Vogt of Deutz, and was the son of Adolf I of Lotharingia, count in Keldachgau, Vogt of Deutz.
He left two sons: His ancestor Herman II lord of Saffenberg is supposedly the son of Herman I of Lothringen and his brother is Steffan Saffenberg( abbot of Prüm 993- 1001).
Ermengarde of Tours
Ermengarde of Tours (d. 20 March 851) was the daughter of Hugh of Tours, a member of the Etichonen family.
In October 821 in Thionville, she married the Carolingian Emperor Lothair I of the Franks (795–855).
In 849, two years before her death, she made a donation to the abbey Erstein in the Elsass, in which she is buried.
Lothair and Ermengarde had eight children:
Lambert, Margrave of Tuscany
Lambert( died after 938) was the second son of Adalbert II of Tuscany and Bertha, daughter of Lothair II of Lotharingia.
He succeeded his elder brother, Guy, as count and duke of Lucca and margrave of Tuscany on his death in 928 or 929 without heirs.
In 931, before 17 October, Hugh, King of Italy, disowned and removed Lambert, giving Tuscany and the familial possession of Lucca to his brother Boso.
Hugh was Guy and Lambert's half- brother, as they had the same mother.
When Guy died, Hugh married Guy's widow, Marozia.
Theobald of Arles
Theobald( c. 854-895), count of Arles, was a Frank from the Bosonid- family.
He was a son of Hucbert and married Bertha, an illegitimate daughter of Lothair II, King of Lotharingia, who was renowned for her beauty and spirit.
They had two sons Hugh of Italy and Boso of Tuscany.

Question: Where did Lothair Ii's mother die?
Answer: Erstein