Dirk Lochlin Struan is the fictional main character of James Clavell's 1966 novel Tai-Pan. The title comes from a Cantonese term that Clavell loosely translates as "supreme leader", and Struan is the taipan or head of his own trading company in China, Struan's. In Clavell's literary universe, moreover, Struan is presented as the Tai-Pan, and his company as the Noble House, the greatest private trading company in nineteenth-century Asia. A Scotsman, "the devil Struan" is portrayed as a tough and resourceful rogue, endowed with vision and determination. A man of extremity, he is capable of tremendous love and terrible hate. He will stop at nothing to protect his home, his family, and the Noble House.
In the back-story as revealed in the novel, Struan begins his nautical adventures as a powder monkey on a King's ship at the battle of Trafalgar, and he remains bound to the sea for life. At the age of fourteen he finds service on an East India Company merchant ship to China, under the command of his future nemesis Tyler Brock. He suffers ruthless punishment from Brock and makes a holy oath to someday destroy him. On a fateful night the ship runs aground on a reef and sinks. Struan swims ashore and finds his way back to the local Portuguese trading settlement of Macao.
Thereafter Struan works only for himself; he starts by practising piracy on Chinese junks and uses them to make dangerous opium runs up the China coast. He expands his smuggling business and eventually masses a fleet of clipper ships and a large fortune. But Tyler Brock also survives the shipwreck to found his own company, Brock and Sons. The two rivals rise to dominate the China trade. But Struan is almost always a little stronger, a little smarter, and a little richer than his nemesis.
The enmity between Struan and Brock is a prominent theme in Clavell's Asian Saga. Struan dies in a typhoon before he can fulfil his oath to destroy Brock. Both men leave many children, legitimate and illegitimate, who take up their fathers' mantles and continue the battle. Thus begins a vicious cycle which lasts many years. It is passed down through the generations. The last descendant of Tyler Brock, Quillan Gornt, dies in a boating accident over 120 years later. After this accident there is no one from the Brock line left to threaten the Noble House.
Struan has a Chinese mistress, May-may, and their romance is developed within the conventions of the genre as the basis for the novel's optimistic theme of cross-cultural fusion. The character also has several children who feature in the story, including Culum Struan, Winifred Dunross and Gordon Chen.
Clavell's hero was inspired by the historical William Jardine, and the Noble House of Struan's is modelled on the real-life "Princely House" of Jardine, Matheson & Co of Hong Kong.