Answer:
The 1420s were a decade of significant historical events. Here are some of the major events that occurred during this period:
1. 1420: The Treaty of Troyes is signed, which recognizes Henry V of England as the heir to the French throne.
2. 1421: The Chinese explorer Zheng He begins his first voyage to Southeast Asia and the Indian Ocean.
3. 1422: Henry VI becomes King of England at the age of 9 months, following the death of his father, Henry V.
4. 1428: The Siege of Orléans begins, a turning point in the Hundred Years' War between England and France.
5. 1429: Joan of Arc arrives at the court of Charles VII of France, claiming that she has been sent by God to help defeat the English.
6. 1429: The Battle of Patay is fought, in which the French army, led by Joan of Arc, defeats the English.
7. 1429: The Treaty of Arras is signed, ending the conflict between the Burgundians and the French in the Hundred Years' War.
8. 1429: The University of Rostock is founded in Germany, becoming one of the oldest universities in Europe.
These are just a few of the significant events that occurred during the 1420s. The decade was marked by political and military conflict, exploration, and the founding of institutions that have had lasting impacts on European history.