Final answer:
The term 'ultra-royalists' could refer to those opposing a constitutional charter in a European context, desiring a return to monarchical absolutism. However, the opposition to the US Constitution in 1787, which is noted in the provided materials, is characterized by those known as 'Anti-Federalists', who feared a powerful central government and advocated for strong state governments.
Step-by-step explanation:
The Charter of 1815, often associated with the Charter introduced by King Louis XVIII of France, refers to the constitutional text that sought to establish a constitutional monarchy following the Napoleonic Wars. As such, individuals opposing the Charter of 1815 in France were not referenced in the provided materials, which focus on American history and the Constitution. However, in the wider context of European political history, those who might oppose liberal constitutional texts could, in certain instances, be referred to as ultra-royalists. These were typically conservatives who desired a return to absolutism and rejected constitutional limits on monarchical power.
There seems to be some confusion here, as the provided materials and historical context mainly cover the period associated with the drafting and opposition to the United States Constitution and not the French Charter of 1815. Nevertheless, if we consider the context of US history, the Anti-Federalists were those who opposed the ratification of the US Constitution in 1787, fearing that it would create a too-powerful central government at the expense of state sovereignty and individual liberties. Within the scope of the American debate, they favored strong state governments and a weak national government.