The earliest definite mention of cricket is dated Monday, 17 January 1597 (i.e., a Julian date which is 1598 by modern reckoning under the Gregorian calendar). The reference is in the records of a legal case at Guildford re the use of a parcel of land c.1550 and John Derrick, a coroner, testified that he had at that time played cricket on the land when he was a boy. Cricket may have been a children's game in the 16th century but, about 1610, the earliest known organised match was played and references from that time indicate adult participation. From then to 1725, less than thirty matches are known to have been organised between recognised teams. Similarly, a limited number of players, teams and venues of the period have been recorded.