Another tumulus of equal interest historically is that of Alyattes, near Sardis, described with such care by Herodotus,[115] and which was explored 35 years ago by Spiegelthal, the Prussian consul at Smyrna.[116] According to the measurements of Herodotus, it was either 3800 or 4100 ft. in circumference; at present it is found to be 1180 ft. in diameter, and consequently about 3700 ft. in circumference at the top of the basement, though of course considerably more below. It is situated on the edge of a rocky ridge, which is made level on one side by a terrace-wall of large stones, 60 ft. in height; above this the mound rises to the height of 142 ft.: the total height above the plain being 228 ft. The upper part of the mound is composed of alternate layers of clay, loam, and a kind of rubble concrete. These support a mass of brickwork, surmounted by a platform of masonry; on this one of the steles described by Herodotus still lies, and one of the smaller ones was found close by. The funereal chamber was discovered resting on the rock at about 160 ft. from the centre of the mound. Its dimensions were 11 ft. by 7 ft. 9 in., and 7 ft. high; the roof flat and composed of large stones, on which rested a layer of charcoal and ashes, 2 ft. in thickness, evidently the remains of the offerings which had been made after the chamber was closed, but before the mound had been raised over it. There are in the same locality an immense number of tumuli of various dimensions, among which Herr Spiegelthal fancies he can discriminate three classes, belonging to three distinct ages; that of Alyattes belonging to the most modern. This is extremely probable, as at this time (B.C. 561) the fashion of erecting tumuli as monuments was dying out in this part of the world, though it continued in less civilised parts of Europe till long after the Christian era. The tumuli that still adorn the Plain of Troy are probably contemporary with the oldest of the three groups of those around the Gygean Lake. Indeed, there does not seem much reason for doubting that they were really raised over the ashes of the heroes who took part in that memorable struggle, and whose names they still bear.