MADRID, April 5 - RAPSI, Sergei Sarymov. Miguel Roca, one of the "fathers" of the 1978 Spanish Constitution, will represent the daughter of King Juan Carlos of Spain in a widening corruption investigation, La Vanguardia reported on Friday.

The court has summoned Princess Cristina, 47, to testify in court on April 27 as part of the Noos corruption case against her husband Inaki Urdangarin, a former Olympic handball player, and his former business associate Diego Torres.

They are believed to have created a network of companies to embezzle around 6 million euros ($7.7 million) in public funds from the non-profit Noos Foundation.

The decision to summon the princess was made after Torres supplied e-mails that indicate she knew about her husbands dealings in the Noos Foundation and consulted him on some issues.

The Spanish royal household has decided to ask Roca to represent the princess if the appeal to withdraw the summons is rejected. King Juan Carlos, who has known Roca for about 40 years, has personally asked him to help his daughter.

The lawyer has so far declined to comment on the issue.

The investigation against Inaki Urdangarin began in December 2011, and he was summoned twice to court - in February 2012 and February 2013. He told the court on Feb. 23 that the royal household did not play any role in the activities carried out by the Noos Foundation.

The prosecutors believe that Urdangarin and Torres inflated the prices of the services that they provided to the administration of a Spanish city and channeled the embezzled funds to other companies and offshore accounts that they controlled.

They have been charged with misappropriation of funds, corruption, fraud and document forgery. Urdangarin has denied any wrongdoing.