Since most aspects of an agreement are non-binding, there are few remedies for non-compliance by either party. They apply only to the legally binding conditions mentioned above. If one party objects to these binding conditions, the other party may seek an injunction, a declaration of appropriate damages, damages or a specified benefit. In developing such agreements, states will take into account their impact on local government. In medieval Europe, it was generally accepted that the Pope was the first place among all sovereigns and that he followed the emperor of the Holy Roman Empire.  The Pope also had the exclusive right to determine the primacy of all others.   This principle was first challenged by a Protestant ruler, Gustav Adolf of Sweden, and then maintained by his country at the Congress of Westphalia.  Britain later claimed in 1718 a break from the old principle of the four-man alliance.  [Note 2] But it was only at the Congress in Vienna in 1815, when it was decided (due to the abolition of the Holy Roman Empire in 1806 and the weak position of France and other Catholic states to impose themselves) and that all sovereign states, be they monarchies or republics, were treated on the same level.  When several heads of state or their representatives meet, priority is generally determined by the host in alphabetical order (regardless of the language of the host, whereas French was the lingua franca of diplomacy for much of the 19th and 20th centuries) or after the date of accession.  International law of contemporary priority, based on the principles generally recognized since 1815, stems from the Vienna Convention on Diplomatic Relations (particularly Articles 13, 16.1 and iii).
 Although many constitutions, particularly in the 19th century and in the past, do not mention any head of state in the general sense of several current international treaties, those holding functions corresponding to this position are recognized as such by other countries.   In a monarchy, the monarch is generally understood as head of state.    The Vienna Convention on Diplomatic Relations, which has codified long-standing mores, assumes that the head of a diplomatic mission (i.e. ambassador or not) of the state of origin is accredited to the head of the host state.  The Head of State accredits (i.e. formally confirms) his country`s ambassadors (or rare equivalent heads of diplomatic mission, such as the High Commissioner or the Pontifical Nuncio) by formally sending a letter of appeasement (and a letter of recall at the end of a term) to other heads of state and, conversely, receiving letters from their foreign counterparts.  Without this accreditation, the head of the diplomatic mission cannot play his role and obtain the highest diplomatic status. The role of a head of state in this regard is codified in the 1961 Vienna Convention on Diplomatic Relations, which ratified (from 2017) 191 sovereign states.
  The head of state is the highest position of the Constitution in a sovereign state. A head of state has some or all of the roles listed below, often based on the constitutional category (above), and does not necessarily regularly exercise the greatest power or influence of governance. There is usually an official public ceremony when a person becomes head of state, or some time later. This may be the swearing-in of the inauguration of a president of a republic or the coronation of a monarch. 2. For proposals other than those that are the subject of a bilateral agreement, the evaluation and approval process on a case-by-case basis is streamlined to achieve safer, faster and more open decision-making. In a parliamentary system such as India and Pakistan, the head of state generally has ceremonial powers, with a separate head of government.  However, in some parliamentary systems, such as South Africa, there is an executive president who is both head of state and head of government.