Definition of "thereto"

'There,' she went on, 'it [a scarab] must be one like it, and yet never did I see one like it, for thereto hung a history, and he who wore it prized it much.[']

1886 October – 1887 January, H[enry] Rider Haggard, “Ayesha Unveils”, in She: A History of Adventure, London: Longmans, Green, and Co., published 1887, page 157

He strung the angelot; / Made rhymes thereto; […]

1840 March, Robert Browning, Sordello, London: Edward Moxon, […], book the fourth, page 154

A man who allows wild passion to arise within, himself burns his heart, then after burning adds the wind that thereto which ignites the fire again, or not, as the case may be.

c. 1955-1956 (written, published c. 1997), Jack Kerouac, Some of the Dharma