| Dates (before 1752 the year ran from 26th March to 25th March - the Julian calendar)
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| From 1752 onward | Year runs from 1st Jan to 31 Dec as now
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| Before 1752 and source uses modern dates | Year is shown as it would be now e.g. 15Feb1751
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| Before 1752 and source uses Julian dates | Julian year is shown, followed by year as it would be now eg 15Feb1750/51
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| Symbols
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| '?' before an event | Indicates event exists at that date but it is not certain it relates to that person
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| '?' after information | Indicates that information is conjectured and cannot be substantiated |
| '---' | A row of dashes indicates information is missing or illegible |
| (sic) | Appears after a possible error noticed in source information
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| Generation numbers (allocated to aid identification of Trease family members)
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| 10 | Walter Trease born around 1500 and possible brothers and sisters of his
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| 11 | Possible children of Walter or of any of his brothers or sisters
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| 12 | Possible grandchildren
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| 13 etc. | Children of grandchildren etc.
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