* Alfonso X of Castile-( 1252 – 1284 )

# Sybilla of Lusignan ( October – November 1198 – c. 1230 or 1252 ), married King Leo II of Armenia

* Principality and Duchy of Anhalt-Bernburg: 1252 – 1468 and 1603 – 1863

* Principality of Anhalt-Zerbst: 1252 – 1396 and 1544 – 1796

* Principality of Anhalt-Aschersleben: 1252 – 1315

* 1252 – Alfonso X is elected King of Castile and León.

It was the difficulty in using the longbow which led various monarchs of England to issue instructions encouraging their ownership and practice, including the Assize of Arms of 1252 and King Edward III's declaration of 1363: " Whereas the people of our realm, rich and poor alike, were accustomed formerly in their games to practise archery – whence by God's help, it is well known that high honour and profit came to our realm, and no small advantage to ourselves in our warlike enterprises ... that every man in the same country, if he be able-bodied, shall, upon holidays, make use, in his games, of bows and arrows ... and so learn and practise archery.

* 1252 – Pope Innocent IV issues the papal bull ad extirpanda, which authorizes, but also limits, the torture of heretics in the Medieval Inquisition.

* 1252 – Conradin, Duke of Swabia ( d. 1268 )

* 1929 – JC Penney opens store # 1252 in Milford, Delaware, making it a nationwide company with stores in all 48 U. S. states.

Fernando III called El Santo ( the Saint ), ( 1198 / 1199 – 30 May 1252 ) was a king of Castile ( 1217 – 1252 ) and Leon ( 1230 – 1252 ).

* March 4 – Blanche of Castile ( d. 1252 )

* October 16 – Amadeus V of Savoy ( b. 1252 )

In 1252, on the death of his mother, Blanche of Castile, Alphonse was joint regent with Charles of Anjou until the return of Louis IX.

In November 1252, the death of his mother Blanche of Castile caused him to go north to Paris and assume the joint regency of the kingdom with his brother Alphonse.

On 23 May 1200, at the age of twelve, Louis married Blanche of Castile ( 4 March 1188 – 26 November 1252 ).

Blanche of Castile ( Blanca de Castilla in Spanish ; 4 March 1188 – 27 November 1252 ), was a Queen consort of France as the wife of Louis VIII.

Louis VIII ( 1187 – 1226 ) – the eldest son and heir of Philip Augustus – married Blanche of Castile ( 1188 – 1252 ), a granddaughter of Aliénor of Aquitaine and Henry II of England.

* Ferdinand III of Castile and Leon ( 1199 – 1252 ), the Saint ; ca. 1217, became king of Castile 1217, of Leon 1230

** Ferdinand III of Castile ( d. 1252 )

Alfonso X ( 23 November 1221 – 4 April 1284 ), called the Wise (), was the King of Castile, León and Galicia from 30 May 1252 until his death.

Alfonso succeeded his father as King of Castile and León in 1252.

* Antonella Liuzzo Scorpo, " Religious Frontiers and Overlapping Cultural Borders: The Power of Personal and Political Exchanges in the Works of Alfonso X of Castile ( 1252 – 1284 )," Al-Masaq, 23, 3 ( 2011 ), 217-236.

* Ferdinand III ( 1201 – 1252 ), King of Castile and León ;

* Ferdinand III of Castile, the Saint ( 1199 – 1252, king from 1217 )

* Alfonso X of Castile ( 1252 – 1284 ): Bertran de Lamanon, Bonifaci Calvo, Guiraut Riquier, Folquet de Lund, Arnaut Plages, Bertran Carbonel

In Spain these laws were further codified between 1252 – 1284 by Alfonso X of Castile with the Siete Partidas.

* Ferdinand III of Castile, the Saint ( 1198 / 9 – 1252 )

A third phase started in 1243 and ended in 1245, when it met the limits agreed between James I and the heir to the throne of Castile, Alfonso the Wise, who would succeed to the throne as Alfonso X in 1252.

Morta ( baptized c. 1252 by the bishop of Chełmno, died c. 1263 ) was the Grand Duchess of Lithuania ( until 1253 ) and later Queen of Lithuania ( 1253 – 1262 ).

* Isabella, Queen of Armenia ( died c. 1252 ), queen regnant

* Queen Isabella I of Cilicia ( 27 January 1216 – 25 January 1217 – Ked, 23 January 1252 )

1204 – Krumau am Kamp, 29 October 1266 ), was a Queen Consort of the Romans 1225 – 35, titular Duchess of Austria in 1252 – 60, and Queen consort of Bohemia 1253 – 60.

* King Ottokar II of Bohemia ( 1233 – 78 ), since 1252 husband of the ( childless ) Margaret of Babenberg, dowager Queen of the Romans and the only surviving sister of Duke Frederick.

* Queen Isabella ( 1219 – 1252 )

A Carmelite monastery was founded at the site shortly after the order itself was created, and was dedicated to Mary, in her aspect of Star of the Sea ( stella maris in Latin )-a common medieval presentation of Mary ; although Louis IX ( of France ) is commonly referred to as the founder, he was not, and had merely visited it in 1252.

Louis was released in 1252 and moved his army to Jaffa.

Simon was formally acquitted on the charges of oppression, but his accounts were disputed by Henry and Simon retired to France in 1252.

Then, in 1252, Alfonso X resurrected another flimsy ancestral claim, this time to the duchy of Gascony, in the south of Aquitaine, last possession of the Kings of England in France.

* Etienne II of Sancerre, Count of Sancerre ( 1252 – 1306 ) Grand Bouteiller of France

Between the years 1252 and 1272, Kentwell Manor appears to have been granted by King Henry III to Sir William de Valence, who was killed in battle in France in 1296.