Daniel 2:41

The kingdom which began by being of iron, ended in being partly of iron and partly of clay, symbolizing its division, one part being stronger than the other.

it shall be a divided kingdom] alluding to the manner in which Alexander's empire, immediately after his death (b.c. 332) was partitioned between his generals, the two who, in the end, divided it substantially between them being Seleucus and Ptolemy Lagi, who founded, respectively, dynasties which continued long in power at Antioch in Syria and in Egypt (see fuller particulars on Daniel 9:5 ff). The stronger kingdom, represented by the iron, is that of the Seleucidae.

strength an unusual word, more exactly firmness.