Catherine of Cleves (1417–1479)
Catherine of Cleves (25 May 1417 – 10 February 1479) was Duchess of Guelders by marriage to Arnold, Duke of Guelders.
She acted as regent of Guelders during the absence of her spouse in 1450.
The Hours of Catherine of Cleves was commissioned for her.
Euphrosina Heldina von Dieffenau
Euphrosina Heldina von Dieffenau, or" Heldin"( died 1636), was a Swedish courtier.
Originally from Germany, she became courtier to Catherine of Sweden, Countess Palatine of Kleeburg in 1590.
After the death of Catherine's mother, Maria of the Palatinate- Simmern, she became the lady- in- waiting, nurse and in practice foster mother of Catherine.
She were the confidant of Catherine and the two of them had a close relationship for the rest of their life, sometimes by letters, which are preserved.
She married a German officer in Swedish service, but remained in the service of Catherine also after Catherine's marriage as her Mistress of the Robes.
She was described as educated and seen as a role model for female nobles in this regard, could speak Latin and was given the task to practice reading and prayer with the heir to the throne, Gustav II Adolf of Sweden, and converse with foreign ambassadors.
Ludmila of Poděbrady
Ludmila of Poděbrady;( 16 October 1456 – Legnica, 20 January 1503), was a member of the House of Poděbrady and by marriage Duchess of Chojnów- Oława- Legnica- Brzeg- Lubin.
She was the youngest daughter of George of Poděbrady( who was elected King of Bohemia in 1458) by his second wife, Johana of Rožmitál(" Johanka z Rožmitálu").
She was named after her maternal grandmother, Ludmila Bawor of Strakonicz.
Sidonie of Poděbrady
Sidonie of Poděbrady( 11 November 1449 – 1 February 1510) was a duchess consort of Saxony.
She was a daughter of George of Poděbrady, King of Bohemia, and his first wife Kunigunde of Sternberg.
She was the twin sister of Catherine of Poděbrady, wife of Matthias Corvinus of Hungary.
Robert W. Levering
Robert Woodrow Levering( October 3, 1914 – August 11, 1989) was a U.S. Representative from Ohio, son-in- law of Usher L. Burdick and brother- in- law of Quentin N. Burdick.
Hynek Boček of Poděbrady
Hynek Boček of Poděbrady( also known as:" Hynek of Poděbrady" or" Hynek Boček of Kunštát and Poděbrady"; or; died: 16 October 1426 in Nymburk) was a Bohemian- Moravian nobleman and follower of the Hussites.
Catherine of Poděbrady
Catherine of Poděbrady (11 November 1449 – 8 March 1464) was the first wife of Matthias Corvinus, King of Hungary.
Matthias Corvinus
Matthias Corvinus, also called Matthias I , was King of Hungary and Croatia from 1458 to 1490.
After conducting several military campaigns, he was elected King of Bohemia in 1469 and adopted the title Duke of Austria in 1487.
He was the son of John Hunyadi, Regent of Hungary, who died in 1456.
In 1457, Matthias was imprisoned along with his older brother, Ladislaus Hunyadi, on the orders of King Ladislaus the Posthumous.
Ladislaus Hunyadi was executed, causing a rebellion that forced King Ladislaus to flee Hungary.
After the King died unexpectedly, Matthias's uncle Michael Szilágyi persuaded the Estates to unanimously proclaim Matthias king on 24 January 1458.
He began his rule under his uncle's guardianship, but he took effective control of government within two weeks.
As king, Matthias waged wars against the Czech mercenaries who dominated Upper Hungary (today parts of Slovakia and Northern Hungary) and against Frederick III, Holy Roman Emperor, who claimed Hungary for himself.
In this period, the Ottoman Empire conquered Serbia and Bosnia, terminating the zone of buffer states along the southern frontiers of the Kingdom of Hungary.
Matthias signed a peace treaty with Frederick III in 1463, acknowledging the Emperor's right to style himself King of Hungary.
The Emperor returned the Holy Crown of Hungary with which Matthias was crowned on 29 April 1464.
In this year, Matthias invaded the territories that had recently been occupied by the Ottomans and seized fortresses in Bosnia.
He soon realized he could expect no substantial aid from the Christian powers and gave up his anti-Ottoman policy.
Matthias introduced new taxes and regularly collected extraordinary taxes.
These measures caused a rebellion in Transylvania in 1467, but he subdued the rebels.
The next year, Matthias declared war on George of Poděbrady, the Hussite King of Bohemia, and conquered Moravia, Silesia, and Lausitz, but he could not occupy Bohemia proper.
The Catholic Estates proclaimed him King of Bohemia on 3 May 1469, but the Hussite lords refused to yield to him even after the death of their leader George of Poděbrady in 1471.
Instead, they elected Vladislaus Jagiellon, the eldest son of Casimir IV of Poland.
A group of Hungarian prelates and lords offered the throne to Vladislaus's younger brother Casimir, but Matthias overcame their rebellion.
Having routed the united troops of Casimir IV and Vladislaus at Breslau in Silesia (now Wrocław in Poland) in late 1474, Matthias turned against the Ottomans, who had devastated the eastern parts of Hungary.
He sent reinforcements to Stephen the Great, Prince of Moldavia, enabling Stephen to repel a series of Ottoman invasions in the late 1470s.
In 1476, Matthias besieged and seized Šabac, an important Ottoman border fort.
He concluded a peace treaty with Vladislaus Jagiellon in 1478, confirming the division of the Lands of the Bohemian Crown between them.
Matthias waged a war against Emperor Frederick and occupied Lower Austria between 1482 and 1487.
Matthias established one of the earliest professional standing armies of medieval Europe (the Black Army of Hungary), reformed the administration of justice, reduced the power of the barons, and promoted the careers of talented individuals chosen for their abilities rather than their social statuses.
Matthias patronized art and science; his royal library, the "Bibliotheca Corviniana", was one of the largest collections of books in Europe.
With his patronage, Hungary became the first country to embrace the Renaissance from Italy.
As Matthias the Just, the monarch who wandered among his subjects in disguise, he remains a popular hero of Hungarian folk tales.
George I of Münsterberg
George I of Münsterberg( also:" George I of Poděbrady"; or; or" Jiří z Poděbrad"; 2 October 1470, Litice Castle – 10 November 1502, Oleśnica) was a member of the House of Poděbrady and a Duke of the Silesian Duchies of Münsterberg and Oels and Count of Glatz.
Catherine of Bosnia, Grand Princess of Hum
" For other people named Catherine of Bosnia, see Catherine of Bosnia( disambiguation)."
Catherine of Bosnia( Bosnian:" Katarina Kotromanić Stjepanova")( b. 1294- d. 1355) was sister of Stephen II, Ban of Bosnia.

Question: Who is Catherine Of Poděbrady's sibling-in-law?
Answer: Ladislaus Hunyadi