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It is not until the turn of the tenth century before sources cast light upon the history of the Kingdom of Strathclyde. At some point after the loss of Al Clud, the Kingdom of Strathclyde appears to have undergone a period of expansion. Although the precise chronology is uncertain, by 927 the southern frontier appears to have reached the River Eamont, close to Penrith. The catalyst for this southern extension may have been the dramatic decline of the Kingdom of Northumbria at the hands of conquering Scandinavians, and the expansion may have been facilitated by cooperation between the Cumbrians and insular Scandinavians in the late ninth- and early tenth centuries. Amiable relations between these powers may be evidenced by the remarkable collection of contemporary Scandinavian-influenced sculpture at Govan. There is reason to suspect that Eochaid reigned during this expansion of the Kingdom of Strathclyde. The Pictish and British realms are certainly not recorded to have been assailed by Vikings during Eochaid's floruit. Furthermore, a union of the Pictish and British kingdoms could well have allowed him to extend British authority southward.