Glasgow itself has been a theme of poetic inspiration from a sufficiently early date. Before the year 597 St. Columba, the great missionary of the Hebrides, paid a visit to the aged St. Mungo at his cell on the bank of the Molendinar. In memory of their converse in that green and holy place, the two old men, it is said, exchanged their staves, and Columba composed a hymn. Of more recent date, but yet old enough, are the lines by John Barclay, minister of Cruden, printed in Skene's "Succinct Survey of Aberdeen" in 1685. They are interesting for the sake of comparison with descriptions of the city by such later poets as John Mayne, John Wilson, Alexander Smith, and Robert Buchanan.