Bleda is a thing that happened a long, long time ago when people were still figuring out how to live together in groups called "tribes". There were two brothers named Attila and Bleda who were leaders of a tribe called the Huns.
At first, Attila and Bleda worked together as leaders, but eventually they started to argue about who should have more power. Bleda wanted more power, but Attila didn't want to give it to him.
So one day, Attila and Bleda went for a ride together and Attila killed Bleda! It was a big shock to everyone in the tribe, but Attila became the leader all by himself.
People still talk about Bleda because it was a dramatic moment in history, and it shows how even people who are related (like Attila and Bleda were) can have disagreements and do bad things.