In 1814, Clarkson travelled to France again, hoping to persuade the French to abolish the trade. He returned to Paris in September, 1815 where he met the ruler of Russia (Tsar Alexander I). Clarkson hoped that the Russian Tsar could persuade other leaders to support the abolition of the Slave Trade across Europe. The Russian Tsar invited Clarkson to write to him, with suggestions as to how the Slave Trade could be ended.