Assertion: kingdom | /r/CapableOf | extend at time
Facets:
value: north of the river thames
type: LOCATION
Source sentences:
text: At times its land extended north of the River Thames, and it eventually expanded westward to cover Devon and Cornwall.
text: The kingdom probably reached the west coast by the mid-7th century, and it also rapidly expanded northward, at one time extending as far as the River Tay.