 Complete the following phrase:  In 1825 he was named a Royal Professor and full member of the Academy of Arts. Many trips to the Russian court in St. Petersburg and the courts in Hanover and Schwerin followed. During a study trip to Paris in 1846, he met Eugène Delacroix. After the revolutions of 1848, he returned to Dessau, but in 1855, he took part in the 