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812 wurde anchialos unter khan krum dem ersten bulgarischen reich eingegliedert und in "tutchon" umbenannt.
the city was first conquered by the bulgarian empire in 812, under khan krum, who settled slavs and bulgars in anchialos.
== die belagerung ==im frühling 809 befahl krum die belagerung der stadt, die jedoch mehrere wochen erfolglos verlief.
== the siege ==in the beginning of 809 krum besieged the city but he could not break the resistance of the garrison for several weeks.