However, there is a historical gap of 300 years between the Chinese and later sources.

Most of the later large sources stem from the area around Florence.

Rather his name has been found in later sources.

It is only later sources which offer suggestions, whose value remains uncertain.

What we have are some rather vague hints in later sources.

In later sources the word appears only as a personal name.

Some later sources reported his success rate at 80%.

However, later sources have served as clues in order to locate it.

According to later sources he ceased using it after her death in 1126.

However the evidence also suggests a later source for this branch of the family.