this second person you mentioned, was he a preacher?
Yes. He was a religious leader, Islamic scholar and theologian
Muhammad ibn Abd al-Wahhab
Muhammad ibn ʿAbd al-Wahhab (; ; 1703 – 22 June 1792) was a religious leader, Islamic scholar and theologian 
bahrain is famous for its oil and what else Modern Arab culture and the archaeological legacy of five thousand years of civilization where is this place located? In the Persian Gulf between the Qatari peninsula and the north eastern coast of Saudi Arabia was there any dynasty present in this last place that you have mentioned just now? Yes. Saud dynasty who established it? Muhammad bin Saud when/ 1744 with whom did this mention person form an alliance? Muhammad ibn Abd al-Wahhab what was the reason behind it? To provide the ideological impetus to Saudi expansion
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Muhammad ibn Abd al-Wahhab [SEP] Introduction
Muhammad ibn ʿAbd al-Wahhab (; ; 1703 – 22 June 1792) was a religious leader, Islamic scholar and theologian from Najd in central Arabia, founder of the Islamic doctrine and movement known as Wahhabism. Born to a family of jurists, Ibn ʿAbd al-Wahhab's early education consisted of learning a fairly standard curriculum of orthodox jurisprudence according to the Hanbali school of Islamic law, which was the school most prevalent in his area of birth. Despite his initial rudimentary training in classical Sunni Muslim tradition, Ibn ʿAbd al-Wahhab gradually became opposed to many of the most popular Sunni practices such as the visitation to and veneration of the shrines and tombs of Muslim saints, which he felt amounted to heretical religious innovation or even idolatry.