Somersett's case in 1772 was generally taken at the time to have decided that the condition of slavery did not exist under English law in England. In 1785, English poet William Cowper wrote: "We have no slaves at home – Then why abroad? Slaves cannot breathe in England; if their lungs receive our air, that moment they are free. They touch our country, and their shackles fall. That's noble, and bespeaks a nation proud. And jealous of the blessing. Spread it then, And let it circulate through every vein." However, slavery continued to thrive in England itself, much like it did in the British Empire, until full emancipation in the 1830s. In 1807, following many years of lobbying by the abolitionist movement, led primarily by William Wilberforce, the British Parliament voted to make the slave trade illegal anywhere in the Empire with the Slave Trade Act 1807. Thereafter Britain took a prominent role in combating the trade, and slavery itself was abolished in the British Empire (except for India) with the Slavery Abolition Act 1833. Between 1808 and 1860, the West Africa Squadron seized approximately 1,600 slave ships and freed 150,000 Africans who were aboard. Action was also taken against African leaders who refused to agree to British treaties to outlaw the trade. Akitoye, the 11th Oba of Lagos, is famous for having used British involvement to regain his rule in return for suppressing slavery among the Yoruba people of Lagos in 1851. Anti-slavery treaties were signed with over 50 African rulers. In 1839, the world's oldest international human rights organization, British and Foreign Anti-Slavery Society (now Anti-Slavery International), was formed in Britain as by Joseph Sturge, which worked to outlaw slavery in other countries.