The following pages contain the results, not devoid of interest, if meagre in quantity, of various short visits to the valley of the Caystrus in Central Phrygia, and to the hills which bound it on the north and south. This valley formed the meeting-place of five great Anatolian roads, the northern and central trade-routes from the east, the highways to the west coast down the Maeander valley or past Akmonia or Eucarpia and Sardis, and the road to the Bosporus by way of Dorylaeum. Naturally therefore the valley of the Caystrus was traversed by many generals or governors or other persons known to history, and, little as history has recorded of the state of the valley at different periods, enough has been gleaned from various writers to enable us to fix the main features of its ancient topography. It was traversed from west to east by Cyrus the Younger and Xenophon in 401 B.C. Alexander the Great crossed it from south to north on his way from Celaenae to Gordium in 333 B.C. The battle of Ipsus was fought somewhere near its eastern end in 301 B.C. The plunder-laden army of Cn. Manlius Vulso moved slowly over it, proceeding northwards, in 191 B.C. Cicero travelled through it on his way from Synnada to Philomelium in 51 B.C. To cut short a long list, this valley was the scene of a fierce battle between the emperor Alexius I and the Turks in A.D. 1116; the account given by Anna Comnena of this campaign is the fullest record we possess on the ancient topography of the Caystrus valley, and it throws some light on places in the hills to the north.