. . . . . . . . . . . . . . . . . . . . . . . . . . . . . "Northern Song dynasty"@en . . . . . "Northern Song Dynasty"@en . "branch and era of Song dynasty"@en . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . "Northern Song dynasty"@en . . . . . . . . . . . . . . . "Northern Song dynasty"@en . . . .