"He sequestered himself in his study to write his blog posting".
A house that Partner-who-loves-tea and I fancied, in its quiet sequestered spot.
It should be noted that despite some dictionaries saying sequestrate means the same thing as sequester it is rarely, if ever, used in that context. Adding the extra 'at' would be pointles. Sequestrate is used instead to mean to seize assets (as the UK government did with trade union funds in the 1980's),