Julius Henry, Duke of Saxe-Lauenburg
Julius Henry of Saxe-Lauenburg (9 April 1586 – 20 November 1665) was duke of Saxe-Lauenburg between 1656 and 1665.
Before ascending to the throne he served as Field Marshal in the imperial army.
John IV, Duke of Saxe-Lauenburg
John IV of Saxe- Lauenburg( *?– 1414*) was a son of Duke Eric IV of Saxe- Lauenburg and Sophia of Brunswick- Lüneburg.
Duke Francis Henry of Saxe-Lauenburg
Francis Henry of Saxe- Lauenburg( born: 9 April 1604; died: 26 November 1658) was a Prince of Saxe- Lauenburg
John V, Duke of Saxe-Lauenburg
John V of Saxe- Lauenburg( also numbered John IV; 18 July 1439 – 15 August 1507) was the eldest son of Duke Bernard II of Saxe- Lauenburg and Adelheid of Pomerania- Stolp( 1410 – after 1445), daughter of Duke Bogislaus VIII of Pomerania- Stolp.
He succeeded his father in 1463 as duke of Saxe- Lauenburg.
Bernard II, Duke of Saxe-Lauenburg
Bernard II of Saxe- Lauenburg( ca. 1385/1392–16 July 1463) was a member of the House of Ascania and Duke of Saxe- Lauenburg from 1426 to 1463.
His full title was Duke of Saxony, Angria and Westphalia, however only ruling the branch duchy of Saxe- Lauenburg between 1426 and 1463.
Eric IV, Duke of Saxe-Lauenburg
Eric IV of Saxe-Lauenburg (1354 – 21 June 1411 or 1412) was a son of Eric II, Duke of Saxe-Lauenburg and Agnes of Holstein.
Eric V, Duke of Saxe-Lauenburg
Eric V of Saxe- Lauenburg( died 1436) was a member of the House of Ascania; son of Duke Eric IV of Saxe- Lauenburg and Sophia of Brunswick- Lüneburg.
Eric V and his brother John IV jointly succeeded their father in 1412 as dukes of Saxe- Lauenburg.
After John IV had died in 1414, Eric ruled alone.
Francis Charles of Saxe-Lauenburg
Francis Charles of Saxe- Lauenburg( born: 2 May 1594; died: 30 November 1660 in Neuhaus) was a prince of Saxe- Lauenburg and a general during the Thirty Years' War.
Magnus I, Duke of Saxe-Lauenburg
Magnus I of Saxe-Lauenburg (1 January 1470 – 1 August 1543) was a Duke of Saxe-Lauenburg from the House of Ascania.
Eric II, Duke of Saxe-Lauenburg
Eric II of Saxe-Lauenburg (1318/1320 – 1368) was a son of Duke Eric
I of Saxe-Lauenburg and Elisabeth of Pomerania (
*1291–after 16 October 1349
*), daughter of Bogislaw IV, Duke of Pomerania.
Eric II succeeded his father, after his resignation in 1338, as duke of Saxe-Ratzeburg-Lauenburg, a branch duchy of Saxe-Lauenburg.
Eric II and his cousin Albert V of Saxe-Bergedorf-Mölln ravaged merchants and other travellers passing their duchies.
In 1363 the city of Hamburg and Adolphus IX (aka VII) "the Mild", Count of Schauenburg and Holstein-Kiel, supported by his relative Prince-Archbishop Albert II of Bremen, freed the streets northeast of the city from the brigandage by Eric II and Albert V, conquering the latter's castle in Bergedorf.

Question: Where did Eric Iv, Duke Of Saxe-Lauenburg's father die?