Dalton is first mentioned in April 1409, when he imported a mixed cargo of merchandise, including soap, alum and iron into Newcastle-upon-Tyne. His career must have been greatly helped by his marriage, early in 1411, to Agnes, the elder daughter of Robert Hebburn, although this did not go unopposed. A dispute evidently occurred between him and another local merchant named William Moreton over their respective rights to her hand; and in January of that year Thomas Langley, bishop of Durham, delegated two commissaries to pronounce judgement, which they did in Dalton’s favour. His appointment, in April 1413, as controller of customs at Newcastle probably owed a good deal to his influential father-in-law, who then held office in the port. Dalton first attended the parliamentary elections for Newcastle in the following May, and thus helped to return himself to the House of Commons. He took part in six more elections between then and December 1421, being regularly named among the 12 probi homineswhose task it was to choose representatives for the borough, but so far as we know he did not again stand as a candidate.
Not much is known about Dalton’s involvement in the local property market, although he evidently owned two tenements near the church of All Saints, Newcastle. From September 1415 onwards, much of his time was taken up with the administration of Robert Hebburn’s estate, for he had been appointed as supervisor of the latter’s will, and had also been entrusted with the responsibility of finding a suitable husband for his young sister-in-law, Margaret. In May 1419, Dalton was pardoned a sentence of outlawry incurred for his failure to appear in court when being sued by the master and scholars of Balliol college, Oxford, for a debt of £15.
