Starting with the Saadians, and continuing with the Alaouites (their successors and the reigning monarchy today), Moroccan art and architecture is portrayed by modern (Western) scholars as having remained essentially "conservative"; meaning that it continued to reproduce the existing style with high fidelity but did not introduce major new innovations. The Saadians, especially under the sultans Abdallah al-Ghalib and Ahmad al-Mansur, were extensive builders and benefitted from great economic resources at the height of their power in the late 16th century. In addition to the Saadian Tombs, they also built the Ben Youssef Madrasa and several major mosques in Marrakesh including the Mouassine Mosque and the Bab Doukkala Mosque. These two mosques are notable for being part of larger multi-purpose charitable complexes including several other structures like public fountains, hammams, madrasas, and libraries. This marked a shift from the previous patterns of architectural patronage and may have been influenced by the tradition of building such complexes in Mamluk architecture in Egypt and the "külliye"s of Ottoman architecture. The Saadians also rebuilt the royal palace complex in the Kasbah of Marrakesh for themselves, where Ahmad al-Mansur constructed the famous El Badi Palace (built between 1578 and 1593) which was known for its superlative decoration and costly building materials including Italian marble.