Year 1420 -LRB- MCDXX -RRB- was a leap year starting on Monday -LRB- link will display the full calendar -RRB- of the Julian calendar .
The Madeira Islands were discovered by the Portuguese Joao Goncalves Zarco .
The Madeira Islands were discovered by the Portuguese Joao Goncalves Zarco .
단순화를 위해 이 문장을 다시 작성하십시오: Year 1420 -LRB- MCDXX -RRB- was a leap year starting on Monday -LRB- link will display the full calendar -RRB- of the Julian calendar . 산출: