The empires of the Commonwealth share a monarch, currently Elizabeth II. In areas other than the United Kingdom, a Governor General (Governor General in Canada) is appointed by the Sovereign, usually on the advice of the competent Prime Minister (although this is sometimes based on the outcome of a vote in the competent parliament, as is the case for Papua New Guinea and the Solomon Islands), as a representative and on the exercise of almost all royal prerogatives in accordance with established constitutional authority. In Australia, it is generally believed that the current Queen is the head of state, since the governor general and state governors are defined as their ”representatives”.  However, since the Governor General performs almost all of the national royal functions, the Governor General has sometimes been designated as Head of State in political and media discussions. held by the Hashemite king of Iraq, during his short-lived federation with Jordan, his Hashemite brother kingdom). Primogeniture, where the monarch`s oldest child becomes the first monarch, is the most common system in hereditary monarchy. The order of succession is usually influenced by gender rules. Historically, the ”aganatic primogeniture” or ”primogenian patrilinear”, that is to say the heredity after the age of birth among the sons of a monarch or a head of family, the sons and their male edition inheriting their brothers and their problem, inheriting males in front of women of the male lineage.  This is the same as semi-Sain primogeniture. The total exclusion of females from dynastic succession is usually referred to as the application of saline law (see Terra salica). .