Peter I of Courtenay
Peter I of Courtenay( September 1126 – 10 April 1183) was the youngest son of Louis VI of France and his second wife, Adélaide de Maurienne.
He was the father of the Latin Emperor Peter II of Courtenay.
Peter was born in France and died in Palestine.
In about 1150, he married Elizabeth de Courtenay( 1127 – September 1205), the daughter of Renaud de Courtenay and Hawise du Donjon, thus starting the Capetian line of the House of Courtenay.
Rumor has it that he is buried in a tomb in the floor of Exeter Cathedral, next to Elizabeth, however no physical evidence currently exists and the Historians at the Cathedral can find no documentation to support this rumor.
The couple had ten children:
Beatrice of Sicily, Latin Empress
Beatrice of Sicily (1252 – 17 November/12 December 1275) was titular Latin Empress as the wife of Philip of Courtenay.
Her parents were Charles I of Sicily and Beatrice of Provence.
Under the Treaty of Viterbo (27 May 1267), Baldwin II of Courtenay transferred much of the rights to the Latin Empire to Charles I. Charles was to be confirmed in possession of Corfu and some cities in Albania.
He was also given suzerainty over the Principality of Achaea and sovereignty of the Aegean Islands, excepting those held by Venice and Lesbos, Chios, Samos, and Amorgos.
The same treaty arranged the marriage of Philip of Courtenay, heir apparent to the Latin Empire, and Beatrice, second daughter of Charles.
If the marriage was childless, Philip's rights would be inherited by Charles I. Beatrice was approximately fifteen-years-old at the time of her betrothal.
On 15 October 1273, Beatrice and Philip were married in Foggia.
The bride was twenty-one-years old and the groom thirty.
Her father-in-law died days later.
Philip was proclaimed emperor with Beatrice as empress.
The marriage was harmonious and produced a daughter, Catherine I of Courtenay, born on 25 November 1274.
Beatrice died in late 1275 after a short illness.
Alice of Courtenay
Alice of Courtenay, Countess of Angoulême( 1160 – 12 February 1218) was a French noblewoman of the House of Courtenay.
Her father was Peter I of Courtenay and her brother was Peter II of Courtenay, Latin Emperor of Constantinople.
Alice married twice; by her second husband, Aymer Taillefer, Count of Angoulême, she was the mother of Isabella of Angoulême, who was Queen consort of England, as the wife of King John.
She is also known as Alix de Courtenay.
Catherine I, Latin Empress
Catherine I, also Catherine of Courtenay (25 November 1274 – 11 October 1307), was the recognised Latin Empress of Constantinople from 1283 to 1307, although she lived in exile and only held authority over Crusader States in Greece.
In 1301, she became the second wife of Charles of Valois, by whom she had one son and three daughters; the eldest of these, Catherine II of Valois, Princess of Achaea succeeded her as titular empress.
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.
Elisabeth of Courtenay
Elizabeth of Courtenay)( ca. 1199–1269 or later) was an Empress consort of Bulgaria, the daughter of Peter II of Courtenay and Yolanda of Flanders.
Elisabeth married Walter of Bar-sur- Seine( died 1219) and then Eudes I Lord of Montaigu.
Elizabeth and Eudes had:
Peter of Courtenay, Lord of Conches
Peter of Courtenay(( – 1249 or 1250 in Egypt) was a French knight and a member of the Capetian House of Courtenay, a cadet line of the royal House of Capet.
From 1239 until his death, he was the ruling Lord of Conches- en- Ouche and Mehun- sur- Yèvre.
He was the eldest of five sons of Robert of Courtenay, Lord of Champignelles( † 1239), and his wife Matilda of Mehun.
From his parents he inherited the castle of Conches and Mehun.
On 25 August 1248, he sailed with his cousin, King Louis IX of France, from Aigues- Mortes to Egypt to fight the Seventh Crusade, during which he died.
Most historians think he died during the battle for the city of Al Mansurah on 8 February 1250.
On that day, Count Robert I of Artois led a vanguard of Crusaders in a spontaneous attack on the city.
The vanguard was caught in a trap set by the defending Mamluks and all attackers were killed.
However, the chronicler Jean de Joinville maintains Peter of Courtenay died on an earlier date.
After the conquest of the Egytion port city of Damietta in June 1249, a large part of the crusader army camped outside the city wall, until they were ready to march to Al Mansurah in the autumn.
The Sultan of Egypt offered a reward of one gold solidus for the head of each crusader.
During the night, Saracens would sneak into the Crusader camp, kill sleeping Crusaders in their tents, and steal their severed heads.
According to Joinville, Peter of Courtenay was the victim of one such attack.
However, Joinville may be mistaken.
One should consider that he wrote his chronicle decades after the fact, and that Peter de Courtenay is mentioned twice later in the chronicle, in connection with the Battle of Al Mansurah.
Agnes of Courtenay
Agnes of Courtenay( c. 1136 – c. 1184) was Queen of Jerusalem as the wife of King Amalric I of Jerusalem.
She was the daughter of Joscelin II of Courtenay by his wife Beatrice of Saone, and the mother of King Baldwin IV and Queen Sibylla of Jerusalem.
Amicie de Courtenay
Amicie of Courtenay( 1250 – 1275) was a French noblewoman and a member of the Capetian House of Courtenay, a cadet line of the House of Capet.
Her father was Peter of Courtenay, Lord of Conches and Mehun( 1218- 1250); he fell in the Battle of Al Mansurah during the Seventh Crusade.
Amicie's mother was Pétronille of Joigny, the daughter of Gaucher de Joigny.
She married Count Robert II of Artois( 1250- 1302), together they had three children:
Charles, Count of Valois
Charles of Valois (12 March 1270 – 16 December 1325), the third son of Philip III of France and Isabella of Aragon, was a member of the House of Capet and founder of the House of Valois, whose rule over France would start in 1328.
Charles ruled several principalities.
He held in appanage the counties of Valois, Alençon and Perche.
Through his marriage to Margaret of Anjou, he became Count of Anjou and Maine.
Through his marriage to Catherine I, titular empress of the Latin Empire, he was titular Latin Emperor of Constantinople from 1301–1307, although he ruled from exile and only had authority over Crusader States in Greece.
The grandson of Louis IX of France, Charles of Valois was a son, brother, brother-in-law and son-in-law of kings or queens (of France, Navarre, England and Naples).
His descendants, the House of Valois, would become the royal house of France three years after his death, beginning with his son Philip VI of France.

Question: Which country Catherine I, Latin Empress's husband is from?
Answer: France