What was the name of the Classical author of the volume?
In the scene where George Smiley falls asleep after his day's exertions which were concluded by making a contact print from the negative hidden in the packet of cigarettes retrieved from Hampstead Heath, he is interrupted by the doorbell ringing. He peers through the curtain and sees Oliver Lacon standing on the doorstep. Smiley quickly conceals the print in an antiquarian folio volume of travellers tales. When Oliver is admitted to the basement room, he casually picks up the volume and asks, "Who the devil was Olivius?" To which Smiley responds anxiously, "A 17th century explorer." "And where did he explore?" Oliver continues. "China,"replies Smiley tersely, and then continues, "Oliver, do you mind putting that down. It is not mine and it is worth half the gross national product."
My question is this: did I hear the name correctly (Olivius) or is it something similar? I have searched Google without success and can find no explorer with even a remotely similar name who went to China in the 17th(?) century. But I feel sure that some knowledgeable person here can enlighten me!