 By offering the Al Saud a clearly defined religious mission, the alliance provided the ideological impetus to Saudi expansion.First conquering Najd, Saud's forces expanded the Salafi influence to most of the present-day territory of Saudi Arabia, eradicating various popular practices they viewed as akin to polytheism and propagating the doctrines of ʿAbd al-Wahhab.According to academic publications such as the Encyclopædia Britannica while in Baghdad, Ibn ʿAbd al-Wahhab married an affluent woman.