The Hashemites are a family of powerful rulers from the Arabian Peninsula. In the early 1900s, they were given control of the holy sites in Jerusalem, which are places visited by millions of people each year to follow their religious beliefs. These sites are often very important to religions such as Judaism, Christianity, and Islam. The Hashemites are responsible for taking care of these sites, making sure that they are safe, and that everyone is treated fairly when they visit. This custodianship (taking care of something) is to make sure that these sites remain safe and respected by everyone who visits them.