New Book of Tang: Imperial Clan Genealogical Tables
The 李 (Li) family · Histories
This is a historical genealogy: everyone in it is public, and only its administrators change it. Where each person comes from is in the notes on their page.
Compiled from the Imperial Clan Genealogical Tables of the New Book of Tang, juan 70A and 70B (Tables 10A and 10B), as transcribed on Wikisource: the descendants of Li Gao, Prince Wuzhao of Western Liang, through Taizu (Li Hu), Daizu (Li Bing) and the Tang emperors, 2,482 people in all. The emperors themselves are not in the tables; they are added from the Basic Annals, juan 1 to 10, which say whose son each was. Each person's notes give the juan of the New Book of Tang he is in, linked to that page on Wikisource, and whatever in the transcription needs explaining.
The tables themselves are incomplete: from Xuanzong on, the princes no longer left the palace to set up households of their own, their lines were not divided into branches, and their descendants are mostly missing. A cell of the tables runs a man's offices and titles into his name; this genealogy separates the name out by rule and has checked every cell, and gives his courtesy name, earlier name, adoption and the like under him or in his notes, in the table's own words. It takes the tables as its base text, to be added to and corrected by its administrators from other sources, such as the Old Book of Tang and the Li family genealogies of each place.
The preface to the tables traces the Li back to the Ying clan and down to Li Gao; the line before him is largely legend, with gaps, so this genealogy begins with Li Gao.
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Simplified or traditional characters both work, and so does pinyin - xiaoming or xiao ming. If you only remember how it starts, the first letters alone will do: xm.