Otto was a son of the merchant and county coroner John Nicoll of Bodmin, whom he served as an executor. On account of his official duties in the shire court, John was a familiar figure in the town of Lostwithiel (the seat of the duchy of Cornwall’s administration in the county), where he owned some property,
By the time of his return to the Commons, Otto had already fallen foul of the law, for according to the influential (Sir) Renfrew Arundell* he had in November 1431 invaded the manor of Lanivet with 20 armed men and held it against his powerful opponent for more than a fortnight.
The focus of Nicoll’s life nevertheless remained in Bodmin, where he appears to have assumed his father’s place in local society following in the older man’s death. From the early 1440s he was periodically empanelled on local juries (including those taking the inquisitions post mortem of Sir William Bodrugan* and Henry, duke of Warwick), and attested his neighbours’ property deeds, and by the autumn of 1448 he was sufficiently prominent among the merchants of Bodmin to be elected to the mayoralty in two successive years.
Particularly close ties connected Nicoll with his brother-in-law, John Colyn† of Helland, who had sat for Lostwithiel several years before him. In 1438 the two men were associated in a settlement of some of Nicoll’s lands, and in 1446 Otto found sureties of £100 for the fulfilment of the contract of marriage between Colyn’s daughter Elizabeth and Thomas Treffry the younger.
