Supernovae observed in the Milky Way:
Historical Supernovae

Similar to other galaxies (including the Messier galaxies), there occur supernovae in our Milky Way at irregular intervals of time.

If they are not too heavily obscurred by interstellar matter, they can be seen as very spectacular events in the sky. Unfortunately, though, none of them has been well visible since the invention of the telescope, although modern estimates predict that every few decades one supernova should occur in a galaxy like the Milky Way.

Here we list the supernovae (sometimes only candidates, indicated by question marks) which have been recorded through the history of humanity. 

Year    Date    Con      mag     Remnant    Observed/Comments

2241 BC ??       ?       -10                Dubiously listed in some source
 352 BC ?                                   Chinese; "first such record" according to Hellemans/Bunch
 185 AD         Cen       -2                Chinese
 369 ?                                      Chinese
 386 ?                                      Chinese
 393/396        Tau       -3                Chinese
 437 ?          Gem
 827 ?          Sco/Oph  -10
 902 ?          Cas        0
1006    Apr 30  Lup       -9+-1  SNR 1006   Arabic; also Chinese, Japanese, European
1054    Jul 4   Tau       -6     M1         Chinese, North American (?); also Arab, Japan
1181 ?                           3C 58     Chinese and Japanese
1203 ?          Sco        0
1230 ?          Aql
1572    Nov 6   Cas       -4     Tycho SNR  Tycho Brahe's SN
1604    Oct 9   Oph       -3     Kepler SNR Johannes Kepler's SN
1667?           Cas              Cas A      Flamsteed ? not seen ?

Key:
Year/Date: Time of observation/occurrance,
Con: Constellation, 
mag: estimated apparent magnitude in brightness maximum,
Remnant: Identification of the supernova remnant

Restricting to the more or less safe supernova events, this table reduces significantly, most probably because of poor recording of our ancestors, to only 7 supernovae, one of which (185 AD) was even questioned recently: 

Year    Date    Con  RA      Dec    mag    Comment/SNR

185 AD         Cen  14:20   -60    -2     (-6 mag acc. to Sky Catalog 2000)
 393/396        Tau                 -3                
1006    Apr 30  Lup  15:02.8 -41:57 -9+-1  SNR
1054    Jul 4   Tau  05:34.5 +22:01 -6     M1
1572    Nov 6   Cas  00:25.3 +64:09 -4     Tycho  
1604    Oct 9   Oph  17:30.6 -21:29 -3     Kepler 
1667?           Cas  23:23.4 +58:50  6?    Cas A SN     

A notable event with some similarity to a supernova occurred with the star
Eta Carinae in 1843, when it brightened
to mag -0.8 and became the second brightest star in the heavens after Sirius,
although it is at the great distance of 10,000 light years.

Only two supernovae have been discovered in other galaxies of the Local Group: SN 1885 or S Andromedae in the Andromeda Galaxy M31, and SN 1987A in the Large Magellanic Cloud.