STRAUBING stands at the heart of the Gäuboden, a rich grain-producing district that stretches along the Danube midway between Passau and Regensburg. The Lower Bavarian town experienced a relatively brief but glorious heyday between 1353 and 1425 as the capital of the lesser, Bavarian portion of the eccentric independent Duchy of Straubing-Holland, the greater portion of whose territories lay in the present-day Netherlands.