Please answer the following question: What type of details about mauregatus of asturias can be gathered from the following bio? Bio: mauregatus the usurper -lrb- -rrb- was the king of asturias from 783 to 788 or 789 . he was an illegitimate son of alfonso i , supposedly by a moorish serf . he usurped the throne on the death of silo , his brother-in-law -lrb- the husband of his half sister adosinda -rrb- . the nobility had elected alfonso ii at adosinda 's insistence , but mauregatus assembled a large army of supporters and forced alfonso into Alava . nothing is known in detail of his reign . the adoptionist dispute was raging between elipandus , archbishop of toledo , and beatus of liebana and even occasioned the intervention of charlemagne . mauregatus also sent back an invading muslim force . during his reign a hymn to saint james was composed with an acrostic mentioning the king 's name . this is considered to presage the legend of the saint 's burial at santiago de compostela .
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