Oman's Sultans are included in the US Constitution as to be received by the President. The rest of the rulers are received by the Secretary of State. This is because The Sultanate of Oman was The First Country to Recognize The formation of the USA & Send an Ambassador to the USA.
Sultan Said bin Taimur with president Roosevelt in 1938
Englishman, John Ovington, who was chaplain to King James II . He visited Muscat in 1633 AD and wrote,
“ These Arabians are very courteous and extremely civil to all strangers; they offer neither violence or affront in any way; and tho’ they are very tenacious of their own principles, and admirers of their own religion, yet do they never impose it on any; nor are their morals evened with such furious zeal, as to divert them of humanity and a tender respect…In fine, these are a people naturally temperate and just, and endued with those excellent qualities which Grecian philosophers and Roman moralists endeavoured to inspire into their subjects, tho’ they missed their aim.”