Sinn Fein said they had "no time for antiquated and ridiculous titles" today in response to MP Martin McGuinness's appointment as Steward and Bailiff of the Manor of Northstead.
Mr McGuinness, who famously refused to take his seat for Mid Ulster in Westminster as a symbolic rejection of English rule, was given the title so he could resign.
Parliamentary protocol says that the only way for an MP to resign is to accept an office of profit under the Crown, although the job has no actual responsibilities and is unpaid.
A Sinn Fein spokesman said: "What we need to see now is the writ being moved for a by-election to allow the people of Mid-Ulster to have their say."
Mr McGuinness left his seat to focus on his role as Deputy First Minister of Northern Ireland.
Francie Molloy is to run in his stead.
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