"Curse on Lawrence of Arabia for empowering the House of Saud."
I agree; but Lawrence empowered the house of Hussein (ruling house of Jordan); they were overthrown by the house of Saud in the 1920s, with the help of the muslim brotherhood.
The two families have been rather unfriendly towards each other ever since.
Kim Philby's dear old dad, St. John Philby was instrumental in establishing the House of Saud. He even converted to Islam and married a Saudi girl.
Lawrence did not empower the Hashemites, the House of Hussein. The Hashemites were considered the direct descendants of Mohammed and were the appointed rulers of Mecca and Medina under the Turkish Caliphate.
In 1924 they were overthrown by Ibn Saud who allied with the Inkwan, translated as The Brotherhood. This was an alliance of convenience, and Ibn Saud defeated the Inkwan but kept Wahabbi rule.
I'm not sure what if any relationship the Inkwan has to the Muslim Brotherhood.