The Spanish king's brother-in-law was jailed today after losing an appeal against a graft conviction, the prison authorities said.
Inaki Urdangarin, the husband of King Felipe's sister Cristina entered the prison in Brieva, just over 100 kilometres (62 miles) north of Madrid at 8:00 am (0600 GMT), a spokesman for the facility said.
The former Olympic handball player was sentenced to five years and 10 months in jail in a case which caused uproar in Spain and tainted the royal family's image.
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