Question: Which German prince became a Belgian King and was closely connected to a German-born banker of Jewish descent who was awarded the Order of Leopold?

Context paragraphs:
Battle of Rejaf: King Leopold II, the Belgian king and ruler of the Congo Free State, acquired the Lado Enclave in South Sudan from Britain in 1894 as part of a territory exchange which gave the British a strip of land along the eastern Congo for Belgian access to the navigable Nile.  However, the territory was overrun with Mahdist rebels who had established their stronghold at the town of Rejaf, which occupied a valuable position for trade along the Nile river.  After a wave of new funding from the Belgian government in 1895, King Leopold ordered an expedition to be led into the Lado Enclave to expel the Mahdists and fortify Rejaf as a strategic military and trading outpost.

Lazare Richtenberger: Lazare Richtenberger (1792 – 3 December 1853) was a German-born Belgian banker of Jewish descent.  He was closely connected to the court of Leopold I of Belgium and later was awarded the Order of Leopold.

Julius Leopold Schwabach: Julius Leopold Schwabach (31 May 1831 – 23 February 1898) was a German banker of Jewish descent and British consul-general in Berlin.

List of Belgian monarchs: This is a list of Belgian monarchs from 1831 when the first Belgian king, Leopold I, ascended the throne, after Belgium seceded from the Kingdom of the Netherlands during the Belgian Revolution of 1830.

Congo Arab war: The Congo Arab war (also known as the Congolese-Arab war and the Belgo-Arab War) took place in what is now the Democratic Republic of the Congo between the forces of Belgian King Leopold II's Congo Free State and various Zanzibari "Arab" slave traders led by Sefu bin Hamid, the son of Tippu Tip.  Fighting occurred in the eastern Congo between 1892 and 1894.  It was a proxy war, with most of the fighting being done by native Congolese, who aligned themselves with either side and sometimes switched sides.  The causes of the war were mainly economic, since Leopold and the Arabs were contending to gain control of the wealth of the Congo.  The war ended in January 1894 with a victory of Leopold's forces.  Initially King Leopold II collaborated with the Arabs but competition over the control of ivory and Leopold II's humanitarian pledges to the Berlin Conference to end slavery, turned his stance to confrontational.  The war against the Swahili-Arab economic and political power was presented as a Christian anti-slavery crusade.

Leopold II Tunnel: The Leopold II Tunnel (named after the Belgian king Leopold II) is a highway tunnel in Brussels under the Leopold II-avenue, situated west of the city centre.  It connects the Rogier Tunnel and the Small Ring around Brussels (R20) with the Basiliek Tunnel and the A10 (part of the E40).  The tunnel is of great importance for the traffic entering and leaving the capital.  The structure is 2534 m long, making it the longest tunnel in Belgium.

Leopold I of Belgium: Leopold I (French: "Léopold I" , German and Dutch: "Leopold I" ; 16 December 1790 in Coburg – 10 December 1865 in Laeken) was a German prince who became the first King of the Belgians following Belgian independence in 1830.  He reigned between July 1831 and December 1865.

Order of Leopold (Belgium): The Order of Leopold ("Leopoldsorde" in Dutch, "Ordre de Léopold" in French) is one of the three current Belgian national honorary orders of knighthood.  It is the highest order of Belgium and is named in honour of King Leopold I.  It consists of a military, a maritime and a civilian division.  The maritime division is only awarded to personnel of the merchant navy, and the military division to military personnel.  The decoration was established on 11 July 1832 and is awarded for extreme bravery in combat or for meritorious service of immense benefit to the Belgian nation.  The Order of Leopold is awarded by Royal order.

List of Jewish Nobel laureates: The Nobel Prize is an annual, international prize first awarded in 1901 for achievements in Physics, Chemistry, Physiology or Medicine, Literature, and Peace.  An associated prize in Economics has been awarded since 1969.  Nobel Prizes have been awarded to 881 individuals, of whom 197 - 22.4% - were Jewish or people of Jewish descent, although Jews and people of Jewish descent comprise less than 0.2% of the world's population.

Jacob Epstein (banker): Jacob Epstein (1771 – 16 August 1843) was a Polish banker and philanthropist of Jewish descent.  In early manhood he went to Warsaw, where he succeeded in amassing a large fortune and became one of the most prominent figures in the old Polish capital.  He was the first Jew in Warsaw to discard the old-style Jewish garb and to dress himself and his family in European fashion.  In the November Uprising of 1830–31 Epstein took the part of his oppressed countrymen, and was an officer in the insurrectionary army; but later he seems to have completely regained the favor of the Russian government, as is evidenced by his appointment as banker of the treasury commission of the Kingdom of Poland in 1838.

Supporting paragraphs: Lazare Richtenberger Leopold I of Belgium
Answer: Leopold I