Alexander of Hales was a really smart guy who lived a long, long time ago. He was born in the year 1185 and he lived in a place called Hales in Germany.
Now, Alexander was very interested in something called philosophy, which is all about thinking deeply about how the world works and what we can learn from it. He studied philosophy for many years and he became a great teacher, helping people understand all sorts of big ideas.
One of the most important things that Alexander did was write a big book called Summa Theologiae. This book was all about religion and it helped people understand how to be a good person and how to do the right thing, according to what their religion taught.
Alexander also taught people about a man named Saint Francis of Assisi, who was very famous for being kind to animals and caring for the poor. Alexander believed that Saint Francis was a really important person who had a lot to teach us about being good people.
Even though Alexander lived a long time ago, many people still study his teachings and ideas today. He is remembered as a wise and important philosopher who helped us understand how to live good lives and treat others with kindness and respect.