Hey there, kiddo! Today we're going to talk about Alexander Jannaeus.
Alexander Jannaeus was a king who lived a long time ago in a place called Judea. Judea was a country where a lot of people believed in a religion called Judaism. This was before Jesus was born, so there were a lot of different groups of people who believed different things about Judaism.
Now, Alexander Jannaeus was a king who had a lot of power, but he had a lot of enemies too. Some people liked him and some people didn't. One of the reasons why people didn't like him was because he didn't always get along with the other groups of people in Judea who didn't believe the same things as him.
In fact, Alexander Jannaeus went to war with some of these groups of people. He fought against them and sometimes he won and sometimes he lost. When he won, he made them do what he wanted and sometimes he even made them change their beliefs to be more like his own.
Even though he had a lot of power, Alexander Jannaeus wasn't always happy. He had a lot of problems with the people who didn't like him and he had to worry about being attacked by other countries too. In the end, he died in battle and his wife took over as queen.
So that's a basic explanation of who Alexander Jannaeus was. He was a king who lived a long time ago in a place called Judea and he had a lot of power, but he also had a lot of enemies. He fought against some groups of people and sometimes he won and sometimes he lost.