Traditionally, it was motivated by reason of the head of State's personal status as a sovereign, a rationale explained by the principle par in parem non habet imperium.
从传统上看，这种特殊待遇是根据国家元首作为君主的个人地位确定的，地位平等者之间不存在统治权的原则已对这一逻辑依据作了解释。