originally “If the Hill will not come to Mahomet, Mahomet wil go to the hil” in Of Boldnesse (1625), an essay by the English philosopher and statesman Francis Bacon (1561-1626)
UK, 1920—an Arab man—‘Johnny’, a pet form of ‘John’, is used, with modifying word, to designate a person, especially a man, of the type, group, profession, etc., specified
1809—a transient light preceding the true dawn by about an hour, a phenomenon common in Eastern countries—translates Arabic ‘ṣubḥ kāḏib’—figuratively: a hopeful sign that can prove either illusory or authentic
mid-19th cent.—perhaps from a specific application of the general term of abuse ‘Frog’, aided by the shared initial consonant cluster in ‘French’ and ‘frog’
In French medieval chansons de geste ‘castles in Spain’ denoted fiefs that had to be conquered from the Saracens by the knights to whom they had been granted.