Grand Duke of Yonderre

The Grand Duke of Yonderre (Burgoignesc: Grand Duc Yonderresc, Gothic: Yondersche Großherzog) is the head of state of the Most Serene Grand Duchy Yonderre and commander-in-chief of the Yonderian Defence Force. The Grand Duchy Yonderre was consolidated in the 15th century under Joanus de Martigueux during the Crusader Conquest of Joanusterre as a marcher realm with de Martigueux as Kings of the Goths. This was ratified in 1494 with the Treaty for the guarantee of Joanus' Land. The title of Grand Duke was conferred on future rulers of Yonderre by Pope Gregory XIII in 1574 following lengthy negotiations. The Yonderian nobility and Grand Count Falco I Sentinelleau had wanted the nation raised to the status of a Kingdom but due to stipulations in the Treaty for the guarantee of Joanus' Land, Yonderre could not be made a Kingdom as it belonged to the Crown of the Holy Levantine Empire de jure, despite the treaty having made Yonderre de jure autonmous and de facto independent in 1494.

Grand Duke of Yonderre
Grand Duc Yonderresc Yondersche Großherzog
Shield of Joanus
Incumbent
Auguste IV de Somua since 17 April 1992
Details
Style	His Majesty
First monarch	Joanus de Martigueux as Grand Count
Formation	1464 de facto 1494 de jure
Residence	Collinebourg Palace

The Yonderian monarch is the Grand Duke. Yonderre is an elective Grand Duchy with elections held immediately following the death of the incumbent Grand Duke. The resultant election is the traditional vote between the nine Counts of Yonderre, one of which ultimately ascends to the status of Grand Duke. The vote typically follows a few days after the death of the incumbent Grand Duke, allowing for the nine Counts to gather in Collinebourg. The shortest transition period between Grand Dukes was that of Falco IV Sentinelleau ascending three days after the passing of Auguste III de Somua in 1820, while the longest interval was when Falco I Sentinelleau ascended two months and two days after the passing of Joanus II de Donne in 1564. The longest reigning Grand Duke was Joanus X de Martigueux, whose rule of 62 years and 7 days spanned the latter half of the Great Depression, the entirety of the Second Great War and much of the Occidental Cold War. The shortest reigning Grand Duke was Giles III de Donne whose rule of three months and a day earned him the monicker "the Brief".

The incumbent Grand Duke is Auguste IV de Somua who ascended after the passing of Giles V Sentinelleau on April 17th, 1992. Because of the elective nature of the monarchy, Yonderian regnal names follow a system of Christian name followed by numeral and then the respective house of the Grand Duke, meaning that Auguste IV de Somua is the fourth Auguste to be Grand Duke and that his house is House de Somua.

Kings of the Goths

Name	Lifespan	Reign start	Reign end	Notes	Family	Image
Joanus de Martigueux The Crusader Count	(1436-06-10)10 June 1436 – 20 March 1503(1503-03-20) (aged 66)	15 September 1464 de facto 5 June 1494 de jure	20 March 1502	Reigned de facto 37 years, 6 months and 6 days Reigned de jure 7 years, 9 months and 16 days	House de Martigueux
Mattius-Arnuald Egide de Houicourt The Just	(1465-03-11)11 March 1465 – 20 October 1525(1525-10-20) (aged 60)	20 April 1502	25 October 1525	Reigned 23 years, 6 months and 6 days	House de Houicourt
Joanus II de Donne The Builder	(1495-02-06)6 February 1495 – 12 January 1564(1564-01-12) (aged 68)	11 November 1525	12 January 1564	Reigned 38 years, 2 months and 2 days	House de Donne
Falco Sentinelleau The Good	(1528-05-09)9 May 1528 – 28 December 1592(1592-12-28) (aged 64)	14 March 1564	19 June 1574	Reigned as Grand Count 10 years, 3 months and 6 days	House Sentinelleau

Grand Dukes of Yonderre

Name	Lifespan	Reign start	Reign end	Notes	Family	Image
Falco I Sentinelleau The Falcon Duke	(1528-05-09)9 May 1528 – 28 December 1592(1592-12-28) (aged 64)	19 June 1574	28 December 1592	Reigned as Grand Duke 18 years, 6 months and 10 days Reigned 28 years, 9 months and 19 days in total	House Sentinelleau
Joanus III de Martigueux The Good	(1537-02-01)1 February 1537 – 17 November 1599(1599-11-17) (aged 62)	3 January 1593	17 November 1599	Reigned 6 years, 10 months and 15 days	House de Martigueux
Guillaume I de Donne Guillaume the Older	(1563-12-15)15 December 1563 – 22 August 1614(1614-08-22) (aged 50)	29 November 1599	22 August 1614	Reigned 14 years, 9 months and 6 days	House de Donne
Guillaume II de Banor Guillaume the Younger	(1583-02-16)16 February 1583 – 6 September 1619(1619-09-06) (aged 36)	1 September 1614	6 September 1619	Reigned 5 years and 5 days	House de Banor
Auguste I de Houicourt The Sword	(1572-12-01)1 December 1572 – 22 October 1627(1627-10-22) (aged 54)	15 September 1619	22 October 1627	Reigned 13 years, 1 month and 8 days	House d'Houicout
Auguste II de Houicourt Strongarm	(1590-02-11)11 February 1590 – 15 March 1645(1645-03-15) (aged 55)	1 November 1627	15 March 1645	Reigned 17 years, 4 months and 15 days	House de Houicourt
Guillaume III de Martigueux The Tall	(1597-05-12)12 May 1597 – 12 January 1652(1652-01-12) (aged 54)	23 March 1645	12 January 1652	Ruled 6 years, 9 months and 21 days	House de Martigueux
Falco II Sentinelleau	(1610-09-22)22 September 1610 – 25 February 1659(1659-02-25) (aged 48)	21 January 1652	25 February 1659	Reigned 7 years and 5 days	House Sentinelleau
Joanus IV de Martigueux The Wise	(1609-01-02)2 January 1609 – 21 September 1672(1672-09-21) (aged 63)	1 March 1659	21 September 1672	Reigned 13 years, 6 months and 21 days	House de Martigueux
Giles I Sentinelleau The Boy Duke	(1653-05-06)6 May 1653 – 15 February 1676(1676-02-15) (aged 22)	29 September 1672	15 February 1676	Regined 3 years, 4 months, and 18 days	House Sentinelleau
Joanus V de Banor	(1633-02-19)19 February 1633 – 15 March 1682(1682-03-15) (aged 49)	28 February 1676	15 March 1682	Reigned 6 years and 16 days	House de Banor
Giles II de Donne	(1639-12-29)29 December 1639 – 29 March 1693(1693-03-29) (aged 53)	24 March 1682	29 March 1693	Reigned 11 years and 5 days	House de Donne
Falco III Sentinelleau The Old Kubagnesc	(1643-11-21)21 November 1643 – 25 June 1726(1726-06-25) (aged 82)	7 April 1693	25 June 1726	Reigned 33 years, 2 months and 19 days	House Sentinelleau
Giles III de Donne The Brief	(1659-05-23)23 May 1659 – 30 September 1726(1726-09-30) (aged 67)	29 June 1726	30 September 1726	Reigned 3 months and 1 day	House de Donne
Giles IV de Mortain The Knight of Montcheval	(1690-12-23)23 December 1690 – 6 April 1740(1740-04-06) (aged 49)	6 October 1726	6 April 1740	Reigned 13 years and 6 months	House de Mortain
Joanus VI de Martigueux The Old	(1689-03-16)16 March 1689 – 7 July 1761(1761-07-07) (aged 72)	15 April 1740	7 July 1761	Reigned 21 years, 2 months and 23 days	House de Martigueux
Guillaume IV de Donne The Artist	(1721-03-12)12 March 1721 – 9 August 1775(1775-08-09) (aged 54)	12 July 1761	9 August 1775	Reigned 14 years and 29 days	House de Donne
Joanus VII de Banor Duke of the Vandarch	(1737-10-11)11 October 1737 – 30 March 1787(1787-03-30) (aged 49)	15 August 1775	30 March 1787	Reigned 11 years, 7 months and 16 days	House de Banor
Auguste III de Somua	(1748-01-16)16 January 1748 – 14 May 1820(1820-05-14) (aged 72)	12 April 1787	14 May 1820	Reigned 33 years, 1 month and 3 days	House de Somua
Falco IV Sentinelleau	(1784-12-06)6 December 1784 – 19 February 1842(1842-02-19) (aged 57)	17 May 1820	19 February 1842	Reigned 21 years, 9 months and 3 days	House Sentinelleau
Joanus VIII de Martigueux	(1791-02-12)12 February 1791 – 15 June 1863(1863-06-15) (aged 72)	29 February 1842	15 June 1863	Reigned 21 years, 3 months and 15 days	House de Martigueux
Giles IV Sentinelleau	(1834-03-05)5 March 1834 – 20 February 1895(1895-02-20) (aged 60)	19 June 1863	20 February 1895	Reigned 31 years, 8 months and 2 days	House Sentinelleau
Joanus IX de Somua	(1843-08-11)11 August 1843 – 11 October 1920(1920-10-11) (aged 77)	28 February 1895	11 October 1920	Reigned 25 years, 7 months and 14 days.	House de Somua
Joanus X de Martigueux The Old Cuirassier	(1897-03-22)22 March 1897 – 22 October 1982(1982-10-22) (aged 85)	15 October 1920	22 October 1982	Reigned 62 years and 7 days	House de Martigueux
Giles V Sentinelleau	(1919-01-25)25 January 1919 – 12 April 1992(1992-04-12) (aged 73)	24 October 1982	12 April 1992	Reigned 9 years, 5 months and 20 days	House Sentinelleau
Auguste IV de Somua	(1940-04-09)9 April 1940	17 April 1992	Incumbent		House de Somua