Henry Brooke, 8th Baron Cobham (November 22, 1564 – January 24, 1618 (Old Style)/February 3, 1619 (New Style)) was a English peer and traitor who was implicated in the Main Plot against the rule of James I of England.

Contemporary accounts portray Cobham as a good natured but unintelligent man. He opposed the ascension of James I to the throne, along with Lord Grey of Wilton, alledgedly for pro-Roman Catholic causes. In fact, Cobham's dislike of James probably did arise from quarrels with religious policy, but Lord Grey was anti-Catholic and opposed James for his monetary policies. Cobham shows little political activity prior to James's time, and he seems generally to have been an uninvolved peer. His brother, George Brooke , on the other hand, was involved in radical religious politics.

In 1603, the first year of James I's rule, both Brookes were involved in plots against the king. George Brooke entered into the radical and absurd Bye Plot with two Roman Catholic priests, Watson and Clarke, to kidnap the king and privy council to coerce more positions for Roman Catholics in government.

At the very same time, Grey and Cobham entered into the Main Plot to raise a regiment of soldiers to force a coup d'etat. Cobham and Grey were to raise one-hundred and sixty thousand pounds (a figure that could be safely multiplied by twenty to convert to contemporary money) to bribe or hire an army. Cobham was to be the go-between with the Count of Aremberg , which would negotiate with the Spanish court for the money. The conspirators, upon seizing government, would depose James and put Lady Arabella Stuart on the throne in his stead.

It is very likely that none of the offers from Aremberg were in good faith, and it is exceptionally unlikely that the Spanish court, already deeply indebted to banks in Belgium and Netherlands and having lost its armada and many of its galleons to English pirates, was in any position to offer such an astronomical sum to an unlikely intrigue. However, Cobham believed the offers. He spoke with Walter Ralegh about contacting Aremberg, and he was readying to set forth.

However, the Bye plot was discovered through its hirling "swordsmen," and the Bye plot conspirators were imprisoned. George Brooke may have sought to avoid a death sentence by informing on his brother. In any case, he provided information on the Main plot, and Grey, Cobham, and Ralegh were imprisoned in the Tower. During the trial, the evidence was shown to be inconsistent, especially in regard to Ralegh. The Bye plot conspirators were executed in 1603, and the Main plot conspirators were left in the Tower. In 1604 (new style), Cobham's honors in the Knights of the Garter were taken down and expelled.

After thirteen years in prison, Cobham was executed.

External links

• Lex Scripta on the Bye and Main plots