Hengest and Horsa are two very old guys from a long, long time ago in a place called England. They were like brothers and they were really good at fighting and leading the people who lived there.
One day, the people who were already living in England asked Hengest and Horsa to come and help them fight against some bad guys who were coming to try and take over their land. Hengest and Horsa were really brave and they fought really hard, and they helped the people win the fight.
After that, Hengest and Horsa stayed in England and became really important leaders there. They helped make the land better by building things and making rules to keep people safe. They were so important that people still talk about them today and they are part of very old stories and legends.