The House of Árpád
The House of Árpád was the dynasty that founded and ruled the medieval Kingdom of Hungary for roughly four centuries. Its history stretches from the Hungarian conquest of the Carpathian Basin in the late ninth century to the death of the dynasty's last male king in 1301. It produced some of Hungary's most important rulers, saints, warriors, and international royal marriages.
Árpád and the Hungarian conquest
The dynasty takes its name from Árpád, traditionally regarded as the leader of the Magyar tribal federation during the Hungarian conquest of the Carpathian Basin around 895–907.
Árpád was not a "King of Hungary" in the later Christian sense. He belonged to an earlier period when the Magyars were organized under tribal and princely leadership. According to medieval Hungarian tradition, his father was Álmos, another foundational figure of the dynasty.
Over the generations following Árpád, his family consolidated control over the Carpathian Basin.
From pagan principality to Christian kingdom
The decisive transformation occurred under Grand Prince Géza in the late tenth century. Géza began strengthening relations with Christian Western Europe and encouraged Christianity within his realm.
His son, Stephen I of Hungary, transformed the Hungarian principality into a Christian monarchy.
Stephen was crowned king around 1000/1001. He established dioceses, monasteries and a royal administrative system and integrated Hungary into Christian Europe.
After his death in 1038, Stephen was eventually canonized. He remains Saint Stephen of Hungary, one of the central figures of Hungarian national history.
A dynasty full of succession struggles
The eleventh century was turbulent. Different branches of Árpád's family competed for the throne.
Among the important rulers were Andrew I, Béla I, Géza I and Ladislaus I of Hungary.
Ladislaus I became especially celebrated. Medieval tradition portrayed him as an ideal Christian warrior-king. He expanded Hungarian influence, became closely connected with Croatia, and was canonized in 1192.
He is now known as Saint Ladislaus.
Coloman and Croatia
Ladislaus was succeeded by his nephew Coloman, traditionally called Coloman the Learned.
In 1102, Coloman was crowned King of Croatia. From this period onward, the Hungarian and Croatian crowns were joined under the same monarch, although historians continue to debate the precise constitutional nature of the early relationship.
This substantially increased the political importance of the Árpád monarchy.
Béla II, Géza II and the rise of Hungary
During the twelfth century, Hungary became increasingly connected with the great dynasties of Europe.
Béla II, known as Béla the Blind, became king in 1131.
His son Géza II ruled from 1141 to 1162. Hungary occupied an important position between the Holy Roman Empire, Byzantine Empire, Rus' principalities and the Balkans.
Those international connections became particularly important for Géza's son.
Béla III — one of the great Árpád kings
Béla III of Hungary was one of the most powerful Árpád monarchs.
As a young man, Béla spent years at the Byzantine imperial court in Constantinople. Emperor Manuel I Komnenos even gave him the Greek name Alexios and, for a period, treated him as a potential imperial heir.
Béla returned to Hungary and became king in 1172.
His reign strengthened royal administration and Hungary's international position. His marriages also connected the Árpáds to other major European dynasties.
His first wife was Agnes (Anna) of Antioch, daughter of Raynald of Châtillon and Constance of Antioch.
Their children included Emeric, King of Hungary, and Andrew II, King of Hungary.
Andrew II and the Golden Bull
Béla III's son Andrew II of Hungary became another historically important Árpád monarch.
In 1222, Andrew issued the Golden Bull, one of medieval Hungary's foundational constitutional documents. It established and confirmed privileges of royal servants and placed limitations on certain exercises of royal authority.
Andrew II also participated in the Fifth Crusade.
His children created extraordinary dynastic connections across Europe.
His daughter Elizabeth of Hungary became one of medieval Europe's most famous saints.
Another daughter, Violant (Yolanda) of Hungary, married James I of Aragon.
That marriage is particularly important genealogically because Árpád blood subsequently entered numerous Western European royal houses.
The Mongol invasion
Andrew II's son Béla IV inherited the throne in 1235.
Then catastrophe struck.
In 1241, Mongol armies invaded Hungary and inflicted a devastating defeat on the Hungarian forces at the Battle of Mohi.
Large areas of the kingdom were destroyed.
After the Mongols withdrew, Béla IV undertook an enormous reconstruction program. He encouraged the construction of stone castles and fortified settlements and reorganized defenses.
Because of his rebuilding efforts, Béla IV has sometimes been described as the "second founder of the state."
The dynasty spreads throughout Europe
The Árpáds became connected through marriage with dynasties throughout Europe and the eastern Mediterranean.
Their descendants entered the royal families of Aragon, France, Poland, Bohemia, Byzantium and other European states.
One particularly important route into Western European genealogy runs:
Béla III → Andrew II → Violant of Hungary → Isabella of Aragon → Philip III of France → Philip IV of France → Isabella of France → Edward III of England's immediate royal family
More precisely, Isabella of France married Edward II, and their son was Edward III.
That is why the Árpáds appear in the ancestry of many later European royal families.
The end of the Árpád kings
The thirteenth century brought increasing struggles between the monarchy and powerful Hungarian nobles.
The final male-line Árpád king was Andrew III.
When Andrew III died on 14 January 1301 without a surviving son, the male line of the Árpád dynasty became extinct.
Hungary then experienced a succession struggle involving rulers with Árpád ancestry through women.
Eventually Charles I of Hungary, from the Capetian House of Anjou, established himself as king.
The Árpád dynasty had ended as a reigning male dynasty—but its descendants had already spread throughout European royalty.
Why the House of Árpád matters
The dynasty's importance goes far beyond simply providing Hungary with kings. The Árpáds helped transform a confederation of Magyar tribes into a durable Christian European kingdom. They survived internal wars, conflicts with Byzantium and the Holy Roman Empire, crusading politics and the catastrophic Mongol invasion.
They also produced an unusually large collection of canonized or venerated royal figures—including Stephen I, Emeric, Ladislaus I, Elizabeth of Hungary and Margaret of Hungary.
And because Árpád princesses married into other ruling families, the dynasty did not genetically disappear in 1301. Its descendants continued through female lines throughout European royalty for centuries.
That last point is especially relevant to the royal line you've been researching: Béla III → Andrew II → Violant of Hungary → Aragon → France → England provides a genealogical route by which the Árpád dynasty became ancestral to later Western European royalty. 
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