Sutcliff did plenty of pre-Roman novels, but as far as I know none of them tie directly into the dolphin ring sequence. (One of the Bronze Age books, Warrior Scarlet, does link directly to the Norman-era Knight's Fee, however.)
Here's the timeline I've seen floating around online for the Aquila sequence:
The Eagle of the Ninth (AD 133) The Silver Branch (c AD 280) Frontier Wolf (AD 343) The Lantern Bearers (AD 450) Sword at Sunset (AD 450) Dawn Wind (AD 577) Sword Song (c AD 900) The Shield Ring (c AD 1070)
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Date: 2011-01-17 09:17 pm (UTC)Here's the timeline I've seen floating around online for the Aquila sequence:
The Eagle of the Ninth (AD 133)
The Silver Branch (c AD 280)
Frontier Wolf (AD 343)
The Lantern Bearers (AD 450)
Sword at Sunset (AD 450)
Dawn Wind (AD 577)
Sword Song (c AD 900)
The Shield Ring (c AD 1070)