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In page John Maitland, 1st Duke of Lauderdale:

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Once Charles surrendered to the Scots, Lauderdale veered round completely to the king's cause, had several interviews with him, and engaged in various projects for his restoration, offering the aid of the Scots, on the condition of Charles's consent to the establishment of Presbyterianism, and on 26 December he obtained from Charles at Carisbrooke Castle "The Engagement" by which Presbyterianism was to be established for three years, schismatics were to be suppressed, and the Acts of the Parliament of Scotland ratified, the king in addition promising to admit the Scottish nobles into public employment in England and to reside frequently in Scotland.[1]