Forbes v Cochrane and Cockburn
Forbes v Cochrane and Cockburn (1824) is a decision by the English Court of King's Bench which held that an enslaved person who escaped to a British Royal Navy ship outside the territorial waters of a slave-owning state became free. The case reinforced the legal principle that slavery was not recognized under English common law and established that British warships were treated as an extension of British soil ("floating territory") where English law applied.
Source: Wikipedia — Forbes v Cochrane and Cockburn (CC BY-SA 4.0)