Which is correct? GtG or 11L?

For the year 1625, Eleven Lights pg 162:

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 The Lunars defeat and kill Broyan. Lunar magicians from the Field School of Magic use terrible magics to summon and bind a demon they direct to murder him.

For the year 1627, Guide to Glorantha, pg 738:

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King Broyan, a man of great honor, came with his army. White Bull, Pillager of Pavis, came when Argrath asked his brothers to come. Chieftains of Prax came, and they were called
the Army of the Bull.  The armies clashed at Sword Hill.

To undermine 11L even further, the GtG continues to say:

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Shortly after that the lands of Kethaela, south of Sartar, were plundered by fleets of the horrible Wolf Pirates. Their valiant king, Broyan, was killed defending his folk, and the land fell to ruin. The people asked King Argrath for help.

I've always been under the assumption that the GtG is canon and so I guess 11L is incorrect?  If so, do Lunars kill Broyan or Harrek?  The GtG is not clear on this.