Question: Which  princess of French origin did Conrad IV of Germany married to 

Context:
Henry Raspe, Landgrave of Thuringia
Henry Raspe (German: "Heinrich Raspe" ) (1204 – 16 February 1247) succeeded his nephew Hermann II as Landgrave of Thuringia in central Germany in 1241; he later was elected anti-king in 1246–1247 in opposition to Conrad IV of Germany.
Conradin
Conrad (25 March 1252 – 29 October 1268), called "the Younger" or "the Boy", but usually known by the diminutive Conradin (German: "Konradin" , Italian: "Corradino" ), was the Duke of Swabia (1254–1268, as Conrad IV), King of Jerusalem (1254–1268, as Conrad III), and King of Sicily (1254–1258, "de jure" until 1268, as Conrad II).
Conrad IV of Germany
Conrad (25 April 1228 – 21 May 1254), a member of the Hohenstaufen dynasty, was the only son of Emperor Frederick II from his second marriage with Queen Isabella II of Jerusalem.
 He inherited the title of a King of Jerusalem (as Conrad II) upon the death of his mother in childbed.
 Appointed Duke of Swabia in 1235, his father had him elected King of Germany (King of the Romans) and crowned King of Italy (as Conrad IV) in 1237.
 After the emperor was deposed and died in 1250, he ruled as King of Sicily (Conrad I) until his death.
Elisabeth of Bavaria, Queen of Germany
Elisabeth of Bavaria (  1227 – 9 October 1273), a member of the House of Wittelsbach, was Queen consort of Germany from 1246 to 1254 by her marriage to King Conrad IV of Germany.
Glossary of French expressions in English
Around 45% of English vocabulary is of French origin, most coming from the Anglo-Norman spoken by the upper classes in England for several hundred years after the Norman Conquest, before the language settled into what became Modern English.
 Thoroughly English words of French origin, such as "art", "competition", "force", "machine", "money", "police", "publicity", "role", "routine" and "table", are pronounced according to English rules of phonology, rather than French, and are commonly used by English speakers without any consciousness of their French origin.
Capetian-Plantagenet rivalry
The conflict between the dynasties of the Capetians and Plantagenets covers a period of 100 years (1159-1259), during which the Kingdom of France fought against the Angevin Empire.
 This conflict is also called by some historians, the "First Hundred Years War."
 The conflict is primarily French, since both dynasties were French, the nobles that made up the English army were essentially of French origin, and the foot soldiers of the English king were local recruits in France (Anjou, Guyenne, Normandy, Brittany etc.).
 At this period, the English king's continental possessions were considered more important than his island possessions, and significantly greater than even those of the French sovereign, even if the latter was the overlord of the former for most of the possessions he held on the continent.
 And the official language of the two belligerents is the French of that time.
 French also remained the official language of England until 1361.
 Such is the origin of the expressions that can still be found today on the shields and coat of arms of the English monarchy "Honi soit qui mal y pense" and "Dieu et mon droit".
 The English kings, who were of French origin, took wives from France from the 11th to the 15th century.
 Very rare are those who married a woman of another country, including the cadet branches.
 Hence the Plantagenet monarchs were ethnically French.
Conrad V, Count of Rietberg
Count Conrad V of Rietberg (died 31 October 1472) was Count of Rietberg from 1428 until his death.
 His father was Count Conrad IV of Rietberg.
List of English words of French origin
A great number of words of French origin have entered the English language to the extent that many Latin words have come to the English language.
 According to different sources, 45% of all English words have a French origin.
 This suggests that 80,000 words should appear in this list; this list, however, only includes words imported directly from French, such as both and , and does not include derivatives formed in English of words borrowed from French, including , , , and .
 It also excludes both combinations of words of French origin with words whose origin is a language other than French — e. g.: , , , , , and — and English-made combinations of words of French origin — e. g.: ( + ), ( + ), , , , , , and .
 This list also excludes words that come from French but were introduced into the English language via a language other than French, which include , , , , , , , , , , , , , , and .
Isabella II of Jerusalem
Isabella II (121225 April 1228) also known as Yolande of Brienne, was a princess of French origin who became monarch of Jerusalem.
Conrad IV of Bussnang
Conrad IV of Bussnang or of Bußlingen (died 12 March 1471, Rufach) was a 15th-century Roman Catholic clergyman.
 He was prince-bishop of Strasbourg from 1439, under emperor Albert II of Germany, pope Eugene IV and his metropolitan bishop Dietrich Schenk von Erbach, bishop of Mainz.

Answer: Isabella II