what is hrh

HRH stands for His or Her Royal Highness, which is a style used to directly address or refer to senior members of royal families, usually princes or princesses. The title is bestowed upon royal members at the discretion of the monarch at the time, but was used liberally until World War I. It is typically associated with the rank of prince or princess, although this has not always applied. When used as a direct form of address, spoken or written, it takes the form Your Royal Highness. When used as a third-person reference, it is gender-specific (His Royal Highness or Her Royal Highness, both abbreviated HRH) and in plural, Their Royal Highnesses (TRH) . In British constitutional law, use of the style HRH or simply "Royal Highness" may only be conferred by letters patent. Since 1917, the style has usually been restricted to children of the monarch, or to male-line grandchildren (i.e., the children of the monarch’s sons) . The status has customarily been bestowed to sons and grandsons of the monarch by the monarch since the 18th century, and that was later adjusted to include daughters and granddaughters.