In Cogitosus’s Life of St Brigid the Virgin translation Liam de Paor St Brigid does a fair division into 3 equal parts. The algorithm used is not explained.
"[She divides a silver dish exactly into three]
Her miracles are great, but this one is especially admired.
Three lepers came, asking for alms of any kind, and she gave them a
silver dish. So that this would not cause discord and contention among
them when they came to share it out, she spoke to a certain person expert in
the weighing of gold and silver, and asked him to divide it among them in
three parts of equal weight. When he began to excuse himself, pointing
out that there was no way he could divide it up so that the three parts would
weigh exactly the same, the most blessed Brigid herself took the silver dish
and struck it against a stone, breaking it into three parts as she had wished.
Marvellous to tell, when the three parts were tested on the scales, not one
part was found to be heavier or lighter by a breath than any other. So the three
poor people left with their gift and there was no cause for envy or grudging
between them."
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