Frederick, Count of Saarbrücken
Frederick, Count of Saarbrücken( died 1135) was a German nobleman.
He was the first to style himself" Count of Saarbrücken.
Irmgard of Berg
Irmgard of Berg, heiress of Berg( died 1248 – 1249), was the child of Adolf VI count of Berg( 1185–1218) and Berta von Sayn.
She married in 1217 Henry IV, Duke of Limburg( since 1226), who became count of Berg in 1225.
Henry IV of Limburg- Berg died on 25 Feb 1246; their descendants were counts of Berg, the county of Berg leaving the descendance of the Ezzonen.
William VII of Jülich, 1st Duke of Berg
William VII of Jülich, 1st Duke of Berg( – 25 June 1408) was born in Jülich, as the son of Gerhard VI of Jülich, Count of Berg and Ravensberg, and Margaret, daughter and heiress of Otto IV, Count of Ravensberg, and Margaret of Berg.
Upon his father's death in 1360, William became Count of Berg and Ravensberg, a title that his father had gained by marrying the heiress of Berg and Ravensberg.
In 1380, King Wenzel elevated him to the rank of Duke, thus becoming the first Duke of Berg.
William fought the counties of Mark and Cleves to prevent them from combining but in 1397 he was taken prisoner in the battle of Kleverhamm.
He lost Remagen, Kaiserwerth and Sinzig to his nephew Adolf IV, Count of Kleve- Mark and due to these losses, his sons turned against him and imprisoned him in 1403/ 04.
He ultimately forced them to submit and later supported his brother- in- law Rupert, King of Germany against Guelders- Jülich and won the county of Blankenburg.
William died on 25 June 1408 and is buried in the Abteikirche in Altenberg.
Frederick I, Count of Berg-Altena
Frederick I  (1173–1198) was a count of Berg-Altena, the later County of Mark.
Frederick was the son of Eberhard I, Count of Berg-Altena, and inherited the south-eastern territory of Altena.
He married Alveradis von Krieckenbeck-Millendonk, daughter of Reiner von Krieckenbeck-Millendonk, and they had issue:
Adolf III of Berg
Adolf III of Berg( 1080 – 12 October 1152) was count of Berg from 1093 until 1132, and count of Hövel from 1090 until 1106, and Vogt of Werden.
He was the son of Adolf II of Berg- Hövel, count of Berg, and Adelaide of Lauffen.
He married Adelheid of Cleves( von Kleve), a daughter of Dietrich II count of Cleves( died 1118).
They had issue:
William I of Berg
William I of Berg( c. 1242 – 16 April 1308) was the son of Count Adolf VII of Berg and of Margaret of Hochstaden.
Upon the death of his brother, Count Adolf VIII of Berg, William succeeded as Count of Berg.
Formerly serving as a monk, he was absolved of his religious vows by the pope in order to take the position.
His tenure was notable due to increased and constant conflict with the Archbishop of Cologne.
In 1300 he supported King Albert I of Germany against the Rhenish electors which further strengthened his position against the archbishop.
During his life he started foundations for monasteries and churches, including those in Beyenburg( now part of Wuppertal) and Gräfrath.
He was also served as the benefactor of the citizens of Hückeswagen.
William married Irmgard of Cleves(? –11 May 1319), widow of Conrad I of Saffenburg and daughter of Dietrich VI, Count of Cleves.
William and Irmgard are buried in the Berg family vault of the Altenberg Cathedral.
As William had no children, his nephew Adolf IX of Berg, son of his brother Henry of Berg, Lord of Windeck succeeded him as Count of Berg.
Eberhard I, Count of Berg-Altena
Eberhard IV of Berg, count of Altena (also called Eberhard I von Altena) (1140 – 23 January 1180, buried in Altenberg), son of Adolf IV, Count of Berg and Altena.
He married Adelheid von Arnsberg (van Cuyck) (died 1200), a daughter of Heinrich
I count von Arnsberg (born 1123, died 1185) and Ermengarde (Irmgard) von Freusburg (died 1203).
He inherited the eastern territorium of County of Berg and became the 1st count of Altena from 1161, and Vogt of Werden and Cappenberg (1166–1180).
His territories were later divided between his sons Arnold of Altena (the Isenberg, then Limburg line) and Friedrich I of Altena (the Altena, then Marck line).
He left issue:
Henry, Count of Berg
Henry, Count of Berg, or Heinrich( I) von Berg- Schelklingen( died before 1116) was a count of Berg. Henryk was married to Adelajda of Mochental.
He got three sons( Dypold II, Henryk and Rapot) and three daughters: Rycheza, Zofia and Salomea of Berg.
Adolf I, Count of the Mark
Adolf I,
Count de la Mark( German:" Adolf I. Graf von der Mark und Krickenbeck")( c. 1182? – 28 June 1249), until 1226 also known as Adolf I, Count of Altena- Mark.
He was son of Frederick I, Count of Berg- Altena and Alveradis of Krickenbeck, daughter of Reiner of Krieckenbeck- Millendonk.
Adolf belonged to a collateral line of the counts of Berg and was founder of the new noble branch of the Counts de la Mark.
Following the year 1226, he reunited the lands of the Counts of Berg- Altena, which had been in possession of the counts of Altena and Isenberg, the senior lines of the family ever since the division of their heritage in 1180, thereby forming the county of Mark with its capital city of Hamm.
Moreover, Adolf
I was reeve of the monasteries of Cappenberg and Werden.
Henry of Berg, Lord of Windeck
Henry of Berg, Lord of Windeck( bef. 1247 – 8 March 1290/ 96) was the son of Adolf VII of Berg and Margaret of Hochstaden.
He was the younger brother of Adolf VIII of Berg and William I of Berg. From 1271- 1281
Henry served as a governor for his brother Adolf who became Count of Berg in 1259.
Henry and his brother Adolf supported John I, Duke of Brabant in his succession war for the Duchy of Limburg, which culminated in the Battle of Worringen in 1288.
Henry resided at Windeck castle, probably as an official of his brother.
Windeck was one of the four main Berg castles, which had come into the possession of Berg by 1247.
Henry is buried with other members of the house of Berg at Altenberg Cathedral.

Question: Where did Frederick I, Count Of Berg-Altena's father die?