How did the feudal system change under the normans

After his coronation, William the Conqueror claimed that all the land in England now belonged to him. William retained about a fifth of this land for his own use. Another 25% went to the Church. The rest were given to 170 tenants-in-chief (or barons), who had helped him defeat Harold at the Battle of Hastings. These barons had to provide armed men on horseback for military service. The number of knights a baron had to provide depended on the amount of land he had been given.

When William granted land to a baron an important ceremony took place. The baron knelt before the king and said: "I become your man." He then placed his hand on the Bible and promised to remain faithful for the rest of his life. The baron would then carry out similar ceremonies with his knights. By the time William and his barons had finished distributing land there were about 6,000 manors in England. Manors varied in size, some having only one village, while others had several villages within its territory. (1)

answer: 25.8 years old or 25 years old