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Sir Theodore Janssen, 1st Baronet (c. 1658 – 22 September 1748) was a Dutch-born English financier and Member of Parliament who after a long and successful career in commerce was ruined and disgraced by his part in the South Sea Bubble.


Janssen was born in the Netherlands, but moved to England in 1680, making his home at Wimbledon. He was naturalised as an English subject in 1685, and later knighted by King William III. In 1694 he was a founder-member of the Bank of England, investing £10,000 and becoming a director. In 1697 he published a pamphlet A Discourse concerning Banks, and in 1713 his treatise General Maxims of Trade.

At the particular request of the Prince of Wales, he was created a baronet on 11 March 1715, shortly after the accession of George I. He entered Parliament in 1717 at a by-election, as member for Yarmouth (Isle of Wight).

By 1720, Janssen had accumulated a fortune of almost quarter of a million pounds. However, among his business interests had been the South Sea Company, of which he was a director. On the collapse of the company he, together with the other directors, was arrested and summoned before the House of Commons to account for himself. After he and Jacob Sawbridge, the first two directors to be summoned, had been heard, a motion was proposed and passed unanimously that both "were guilty of a notorious Breach of Trust, as Directors of the SouthSea Company, and thereby occasion'd very great Loss to great Numbers of his Majesty's Subjects, and had highly prejudic'd the publick Credit". They were expelled from their membership of the Commons (as were the other directors subsequently), and their assets confiscated to make reparations to the investors ruined in the crash.

Janssen was almost certainly innocent of any deliberate wrongdoing, and this was recognised by the amount of his fortune that he was permitted to retain when the rest was taken to compensate investors - he was allowed to keep £50,000, a much-higher proportion than most of the other directors.

He died in 1748. He was succeeded in the baronetcy by his son Abraham, who had also been a Member of Parliament at the time of his father's disgrace, but never sat again after the end of that Parliament.

Portrayal in fiction

Janssen is a central character in Robert Goddard's historical novel Sea Change.


Parliament of Great Britain
Preceded by
Henry Holmes
Sir Robert Raymond
Member of Parliament for Yarmouth (Isle of Wight)
with Anthony Morgan

Succeeded by
Anthony Morgan
William Plumer
Baronetage of England
Preceded by
New creation
(of Wimbledon)
Succeeded by
Abraham Janssen


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