All the series of Blackadder are related in the sense that the main character is meant to be a descendent of the previous Blackadder, but in each case several generations apart - they are not the same person. Each generation is hundreds of years apart:

• Blackadder is set in the Middle Ages
• Blackadder II is set in the Elizabethan age
• Blackadder III is set in the English regency period
• Blackadder Goes Forth is set in the First World War on the western front

The character differences are most striking between season 1 and 2, as the writers changed and the budget was reduced, forcing less on-location shooting and a more on-set situation comedy approach, which IMHO dramatically improves the series. The last 3 seasons were all developed by the same team, and Blackadder is substantially the same character in the different eras.

All the series of Blackadder are related in the sense that the main character is meant to be a descendent of the previous Blackadder, but in each case several generations apart - they are not the same person. Each generation is hundreds of years apart:

• Blackadder is set in the Middle Ages. The Prince Edmund character lives 1461–1498.
• Blackadder II is set in the Elizabethan age. Elizabeth lived 1533 - 1603 and she is young woman in the series, so we are looking at 1550-1570 period.
• Blackadder III is set in the English regency period. George ruled as Prince Regent from 1811-1820.
• Blackadder Goes Forth is set in the First World War on the Western Front in 1914-1918

The character differences are most striking between season 1 and 2, as the writers changed and the budget was reduced, forcing less on-location shooting and a more on-set situation comedy approach, which IMHO dramatically improves the series. The last 3 seasons were all developed by the same team, and Blackadder is substantially the same character in the different eras.