In 1922 also, Benito Mussolini was made prime minister by the king. In 1926, the Department of Health undertook a pilot project of the new strategy in the delta of the Tiber River, reclaiming land and creating 45 new homesteads with great success, after which Mussolini climbed aboard. At his request to the Director-general of the Department of Health, Alessandro Messea submitted a plan for the Pontine Marshes. In 1928, Mussolini brought it before parliament; it became "Mussolini's Law", and began to be implemented in 1929. In 1939, at the incorporation ceremony of the last new city, Pomezia, the project was declared complete.